I say this next part at the risk of looking like a tinfoil hat wearing lunatic. As I look at how many games have gone up in price to ridiculous highs I wonder if it's because of the market dictating prices or because of singular unscrupulous individuals profiteering in a hobby for exceedingly small time gain. Seriously, I get the draw of making money from your hobby. That said, the amount of money and more importantly the amount of profit you can make by becoming a low-stakes middle man price fixing "investor" is so low that I absolutely can't see the purpose in trying to be a pro reseller rather than getting a real job. You're definitely making low money while simultaneously ruining the hobby for everyone else.
I don't think we disagree with each other all that much. Also, even if he started buying at $4, the price surely went up as he was trying to manipulate it. Even so, lets take the one completed BIN on eBay, and assume he was able to get every one of his 20 copies at $5 shipped, and sells every single copy at 15 free shipping (to match the sold listing). $10x20 = $200... but...
It costs a minimum of $2.61 to ship a game today, USPS. The envelope costs $0.10. He's paying $1.50 in eBay fees (assuming he isn't a power seller). Paypal fees are 2.9%, or $0.44, + $0.30 per transaction, so all his costs add up to $4.95 a sale, or $99 total. His 'experiment' netted him a whole whopping $101. For a years work.
My point is, it doesn't make sense to buy games at market value today, as an investment in their worth tomorrow. I highly doubt anyone is doing that on a massive scale.
THAT SAID...
I do think prices can be arbitrarily held high by the plenty of people that are in for the flip. I'm guilty of this, and yet, so is price-whiner gynt. Either refreshing eBay constantly to get that sweet too-low priced BIN, for the flip, or going to retro video game stores/conventions, finding things that are 'under current market value' and buying them for the flip. You might already have the game, but there is money to be made between the price its being sold for, and the price you can sell it for. Maybe you already own that game, or maybe you don't even want it, you just want money. The problem is, that removes it from the market, and forces a buyer who actual wants to keep it to pay your higher price. I think this is the only common form of profiteering in this hobby. It does prop up prices to a degree, but that isn't manipulation, its just how markets work.