I own a modded 360, the guy i bought it from modded it. he gave me a stack of copyed games which i will admit ... played and enjoyed. If it falls in your lap you dont say no. I did buy some of the copied games original like CoD4 and Bad Company to be able to play online though. And since then I only buy original games cause it is too much hassle to pirate and i love playing online.
I also modded my Wii for Homebrew, it is now my webserver, i do webdevelopment so i can keep my wii running comsuming next to nothing rather than my 550 watt PC running apache.