Well, I'm not 15 either but, I have 7 machines also. 2 Windows XP machines, 4 FreeBSD Game Servers, and a FreeBSD box as my router, ftp, email, web server. 1 Linksys 8-port switch, 1 16-port Linksys switch, 10 8-port switches. Also a 2-port Linksys KVM switch.
When I was 15 I had an Amiga 2000 that I paid $2000 for. Computers cost too much back then to have this many.
Actually I could add more computers but they are never on. I also have an Amiga 2000, Amiga 3000, 2 486 computers, and parts to build one or two computers laying around in my room.
Now how many Mhz do I have (That I use)..
2.4Ghz + 1.4Ghz + 1.4Ghz + 1Ghz + 450Mhz + 450Mhz + 800Mhz = 7.9 Ghz
Thats not much.. I need to upgrade some of those!