I bought my first xbox for £10 with rrod, fixed it and it ran fine, spent some more modding it and its been completely spot on. Yeah the failure rate aint great but the current generation of kids/adults have no clue on how to even try to fix one. I have fixed 12 for people who's warranty ran out and modded a couple for people I know. I didnt even charge for any of it, just did it because I wanted to see if I could.
Nobody I know even tries to fix things anymore, its all rather sad