Welcome to the club man. It started in the Gamecube days when I'd see games like Super Mario Sunshine that I bought at full price day selling for $10.00 a few years later because it was a player's select title and bemoaned how I could have bought it cheaper. Plus, I started having more cash to buy games so I'd go to EB games a lot and with their edge card offering another 10% off used games, I started buying used titles at saving more money. Then, I discovered Kijiji and could find people selling their used games at fantastically low prices. When I saw people selling their Wii's with a stack of good first party games for $100 dollars or around that price, it made me wonder if I shouldn't just start skipping a generation and then pick everything up for it at the end when people can longer get top dollar for it and just get it all cheap and play it through while the next generation happens.
Even better, a grocery store chain here in Canada called Superstore also has a gas station. So when I fill up with gas, I'll get a $2.00 off coupon to use in the store that will expire in a couple months. Well, in a couple months time of filling up my car, I'll have a bunch of these coupons and then use them all up on a game purchase. Just a couple weeks ago, I went in to use them up at the store happened to be having a sale on Pikmin 3 so that it was only $39.99. Using those coupons, I got it brand new for $23.00. Cha-ching! I'll take that. Already, I see the price of Batman: Arkham Origins has dropped $10.00. Soon, I expect it to sell at places for $19.99 much like the Wii version of Arkham City eventually did.
Once you realize that waiting it out on a game means you can save so much money and yet you still get to play it and it is the same whether you play it now or 1, 2, 10 years later, then it is incredibly hard to ever go back to buying a game full priced. You start to open your eyes to all the ways you work out deals even or watch for price drops. Even with these forums and the amazing deals threads, I've been able to pick up games on the cheap and that's when I'll finally get a game.
There is still a rare exception. Xenoblade, for instance, I wasn't able to get at a low cost because of the scarcity of supply and the retailers who carried it. But it is sitting on the shelf still sealed since I've had no time to play it and because of that, it's price on the online market such as Ebay would allow me to easily make back that money and more so buying it full price almost feels like I got it at a great deal.
It has gotten so bad that I've bought a game for $15.00 dollars that was once $35 dollars at least and then later I see it selling for $7.00 dollars and lament that I bought it too soon and could have gotten a better deal for it. So, even if I never do play all the games I bought, at least I can rest easy knowing that it didn't cost me too much.