I sold my backwards compatible PS3 back in September after having it about 3.5 years. In the whole time I owned it, I purchased 3 games, and barely played any of them. I used it far more to play PS1/PS2 games, the occasional Mega Man 9/10, and for Blu-Ray/Netflix than anything else, but it still sat idle for months at a time.
I do plan on getting a slim closer to the end of the console's life span, as I didn't sell my 7 or so Blu-ray movies or any of the good games. Heck, I even bought a copy of Bayonetta for PS3 on clearance 10 minutes after I sold the thing. In the short term though, I had better uses for the money I got for it and I don't have to worry about YLOD on what was a first revision model.