Like I said, those requests are generally on lengthy lists (30+ titles) filled with games that run the gauntlet from common cheapies to teh rarez that'll run many hundreds of dollars. Such pricey titles could be winnowed out, sure, but what's the point and where do you stop the culling? I'd hate to see people not include a game because the average price on ebay is $35, 'cause Santa might have it sitting in his pile of dupes obtained in economical lots or be able to add it to a yahoo japan order for cheap.
As long as there's enough known cheap games to pick from, who gives a f*ck if there's some pie in the sky requests? Afterall, it is a wishlist.