Majoring in philosophy, tips, advice from seasoned professionals /undergrad/grad/ Made an account just to respond. Here's the deal.... As other people noted philosophy jobs are indeed few and far between. Statistically speaking most people won't finish grad school (most people who go into a phil. PhD program drop out within a few years) and - in most cases - unless you're going to a top-tier program you're probably looking at adjunct work which is going to pay like 35k a year in the US. Even going to a top school won't land you a job because it's academia and people want to see research potential and for you to have the right connections.
The depressing reality is that having a "passion" for philosophy should be what the field requires but it's really not. Roughly 80-90% of the phil. PhD's out there are not there because they were the best, brightest, or loved philosophy the most. They made it through their respective programs and landed jobs simply because they were the most organized and most willing to put up with crap. As a slight warning on that note: many philosophy profs feel burnt out after going through that process and it is not uncommon for them to quit or simply go through the motions for a paycheck later on in their careers.
So that's the relative downside of philosophy, but academia in general is a different ballgame. First, it is in fact an industry. You need to publish. Period. As an undergraduate from a small school the only way I could get recognition from a top-tier program was to publish two papers, present at academic conferences, and become the editor for a journal. In grad school I published four more papers, joined a serious research group, networked a lot, and tried to co-author wherever I could. These days I am quite happy to have a postdoc research position, but it required endless hours of writing, endless hours of criticism, endless hours of sitting through obnoxious meetings being given advice that didn't apply or would have hampered my work, multiple rejections from journals, multiple RR (Revise and Resubmit) decisions for work I didn't want to do any more. It was a chore.
If teaching is your thing, you better be really good. Like next level good. Because most jobs in the US are a mix of teaching, admin work, and research. Pure teaching positions exist, but they are hard to come by in the US. A former colleague of mine landed one recently, but he taught at Yale, was an excellent teacher all around, and had held down several prestigious positions around the US in order to be considered. Those positions usually don't pay that well by the way.
Another thing to remember about academia is that it is indeed cutthroat as someone stated above. It mellows out once you actually land a position, but I absolutely stepped on people during graduate school. Those who want to be good scholars are absolutely willing to throw their colleagues under the bus, steal work, take credit for ideas, bad-mouth each other to lower each others' standing, and systemically find ways to humiliate or degrade their fellow academics. I certainly did and I have absolutely no regrets. But if you want to ACTUALLY get somewhere in the field then be willing to hurt, hinder, lie, cheat, steal, and suck up to get where you want to go. It's not "bad" it's just the nature of the academic game.
Keep in mind that even with a mildly cutthroat attitude - it might not matter. For example: at a former institution of mine I was having a drink with our department chair and he just asked me directly what I thought of one of our assistant profs who was trying to get tenure. I didn't want him to be tenure track, so I straight up said I didn't like him and didn't think he'd be a valuable long term addition to the department. The department head agreed with me - we made fun of him for a bit and moved on. It's been years since then and guess what? That poor guy still isn't tenure track because he just wasn't liked enough by the right people.
Now this isn't to say the field is bad! It's just not for everybody. Personally I love it, but I've always liked the environment. I liked criticism and being able to criticize, I liked (most of) the work load, and I liked being around smart people like myself. But it's not a "noble" pursuit. So if you have pie-eyed dreams of being scholar where you get to sit in a library all day and happily read books and take notes - think again. If you don't publish you probably won't have a job these days or odds are not a great job. Unless you're tenured you'll work 60 hours a week, you'll deal some of the dumbest students in the world (and sometimes their overly involved parents), and you'll deal with an endless supply of bureaucratic red tape.
Phil. is a cool field, but it's just one field among many in an industry called academia. I guess the last bit of advice is simply that liking the field or being passionate about philosophy isn't good enough. You have to have a network, and you need to be more dedicated and more organized than your peers. The alternative is to be brilliant. Literally Wittgenstein levels of brilliance. Which odds are you're not or you'd be somewhere already. That's where dedication and organization come in - they can close the gap a little bit.