What to do with a 2nd computer?

Specs aren't great, I believe they're something like:

4 or 6GB of ram
3 or 4 year old CPU
9500 GTX graphics card
550W PSU
No hard-drive (I think I may have a 200-300GB one lying around somewhere)
no CD drive

It probably can host a... 10-15 person minecraft server (computer wise, internet wise... not so much). 5-7 runescape bots or something along those lines.

What should I do with it? I was thinking about like... splitting it up into a few VMs then giving it to people to bot on for a few $ or some shit. Not really sure. Ideas?

Rent it out as a VPS?

Gold farm on it of course

Gold farm, Then keep the gold or sell it.

Send it to me?
Seems like the best thing to do.

Well, I don't have a 300GB hard-drive lying around. Should I spend 20 to 60 pounds buying a 200-1TB hard-drive?

No, just get a 500gb.