2) "poker is unbeatable" - wrong, it is extremely beatable. Just play the main event each year - massive edge, huge variance. Just play drunk ppl at 1-2NL all over Vegas - extremely beatable, relatively boring & repetitive, beatable by a medium-skilled player for $10-$20/hr in 2013 playing at major casinos on "drunk nights" aka Thurs-Sun each week.
3) Beating sports - it is done by very few - and I mean very fucking few. Google Billy Walters. Google Haralobos Voulgarious Proly gotta spellcheck those. These 2 kill it. A handful of others beat it. Millions claim to know their shit and lose each week.
4) "beating poker knowing something no one else knows" see: Ben Lamb, Chance Kornuth, Jared Bleznick in PLO. See Shaun Deeb in Open Face.
If you enjoy company, alcohol, and relaxation while playing an engaging game, poker's got you. If you want to make a living out of it, you better fucking love repetition, studying the game, and have excellent self-discipline. You may actually be better off grinding video game items, currencies, and character levels (as a matter of fact, I made some tidy sums in high school!). MMORPGs, incidentally, have a lot of the same things going on as in poker, and a lot of the same costs/rewards depending on how seriously you take earning revenue from it. Earning the most valued stuff in MMORPGs is boring as ass. For example, in traditional MMORPGs, this is raiding -- for something like EVE, it's something horrible like corp. mining events, where you're expected to have a regular schedule including carting minerals back and forth between certain times the entire group agrees on - and if you're late, they may well kick you out (this occurs with "raiding" on traditional MMORPGs, too). OTOH, having fun, such as through PvP, where there's a dynamic challenge, is usually a low-to-no reward venture. It's a really fucking bizarre dynamic for games, but it helps stimulate the game-currency<->fiat/BTC exchange. It basically creates jobs. In cases where PvP can be high-reward, you end up with people taking it very seriously - like a job, and it ends up a grind like anywhere else. Even something like SC2 tournaments - you look at players, and they'll have the exact same face on as professional poker players in a tournament. Maybe a weak smile if they win, but otherwise without emotion, because they're being 100% logical, which is almost necessarily not fun.