There are a few on NA that do that 'brute force' purchasing, but it's a small minority. At least in respect to nabbing up a crap load of games at once with no regard to price. Usually on there you'll get people get a brute force pick up but where they've usually cut the seller fairly deep either with good negotiating tactics or luckily enough the other guy had no idea what they had(but anyone can do either.) There are a few annoying types I have seen, but it has been on solitary games, wanting to condition upgrade or get the best right out of the gate and damn the price, usually then in some cases to VGA the stuff to exponentially increase the value. Me I play stuff, affordable for me or not (off and on over the years) I refuse to go sealed. If I buy one I'll damn well open it and play it if it's something I want if the price is cheap, or if I'm tight I'll sell it and get a loose one and more with the funds.
ebay is in part to blame on topic though, but same can be said for craigslist too, kijiji and the rest. Enough thanks to amazon/ebay have been tipped off finding some games are worth a fortune, and they're too stupid/lazy to actually look deeper and think ALL games are worth their weight in gold and that makes it a problem for sure. I for one am patient. It could take me a week, month ,year...10years and I'll wait to get what I want as I'm not going to fall into the trap.