Junk? Other than the 9 year old Pentium 2 all the other PCs are pretty good spec and can run most current games at OK rates.

They all have at least 1GB ram, 9800 Pro 128MB Graphics cards or better, 300GB+ of HD space, decent cases, 8x DVD-RW etc...

Thinking about it, I could just start making lots of MAME cabinets using them and sell them on ebay for a few thousand each!