To be fair, the Combat Arms developers have gone to great lengths to try and make sure anything you can buy with real cash has an equivalent you can earn with in-game GP. Most of their cash items are cosmetic more than anything else.
I also just discovered this morning that you can pick up weapons off fallen enemies in the game, so if somebody just spent a billion dollars (yeah, right) on a shiny new weapon and they die, if you're fast enough, you can run over and pick it up, then use it (default is to hit the "E" key"). I thought that was kind of neat.
As far as paying for games, it's the old adage of, "You get what you pay for". For those that are low on funds and still want to get their MMOG fix though, we're here to try to sort through the riff raff to find some decent games for you. I hope you appreciate my sacrifice, LOL