Bootcamp is NOT virtual booting and if you install Windows, you ARE playing it on Windows. It allows you to partition the drive of a Mac and installs all the drivers to create a dual-boot system. This mean at start up, you have to choose which OS to run, and then it only runs that OS. By itself you cannot run Windows at the same time as the Mac OS. It uses no more memory than if the computer only had one OS installed.
True, upgrading can be an issue, but like I said, if you get one now or closer to when the game comes out, it should at least be sufficient to run the game if not better.
You have to do that anyways if you are purchasing a PC, and its cheaper this way. Only way you wont have to do any of this is if they develop a Mac version, which is unlikely and in the end you will be able to do so much more on your bootcamped Mac.
there is absolutely nothing cheaper about anything do to with macs. they offer subpar parts at inflated prices. the only reason to get a mac is if you have a preference for their OS and their programs like iMovies, iPhoto, iporm etc. and a 4000 dollar mac doesnt even come close to matching a 3000 dollar PC. as they found out with the game Portal(valve) even if you running it in bootcamp the drivers on the mac are not optimized as well as ones on a normal PC. macs will always be playing catch up in that regards.
i built my current PC for $2500 for everything new monitor, new keyboards speakers,,,,,,,everything. i had a i7 processor and a 285gt card that apple didnt even offer at the time and probably still dont. the closest i could get with a mac was a computer that cost over $4000 bucks and it had inferior harddrive and as i mentioned i would have had a weaker graphics card. i recenlty upgrade my PC with a new velociraptor drive and a more powerful CPU which totalled $500 for both so that makes my current rig worth $3000. not bad for an i7 950 OCd at 3.6 GHz, 12 gigs of ram and two velociraptor drives. and a top of the line auzentech sound card 26 inch or 28 (i forgot which one) samsung monitor etc.
as for reliability that is only an issue if you buy crappy PCs like dell or gateway in which case you get what you deserve. i you build it yourself (assuming you arent a total klutz) or have a computer store build one for your then you will find that your PC will run with the exact reliability as a Mac since they are both computers and Macs use alot of PC compenents.....like i said they just dont offer the best ones and they charge alot more.
all that being said i actually hope that they do a mac version if not right away then eventually like that have for some other games in the past. the only reason windows 7 is as good as it is is precisely because apples OS was wiping the floor with them for the last few years. i want more macs sold because competition means better and cheaper stuff for me.