I dont think there is a for sure failure rate reported on them, and to be honest I don't know if i've heard of any breaking (thought i haven't ever looked for reports of it or anything). I just keep hearing the 60GB are dropping like flies though again, I don't know a number to back that up.
If you don't use the B/C feature I really see no reason why you shouldn't sell it and buy a slim though. The soonest ending auction on ebay of a MGS4 PS3 has 7 hours left, needs a new bluray drive and is at $180 right now. So it should end up well over $200 while needing a $100 some repair. You should be able to make around $300 off of selling your system
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