I guess breast implants would be more like an nVidia Trade-Up program...you can make them perform better by just doing it you know. It would be the equivalent of every time you turn on your computer you get a permanent 0.5% overclock.
I'd take an insane gaming rig for my old girlfriend.
1) Computers don't require you spend so much money on them.
2) They can get you more than what you spend on them. (Overclocking)
3) Most of them are pretty hot! (Pun Intended)
4) They never argue with you.
5) The majority of parts come with a warranty. A girl doesn't.
6) Computers are easier to upgrade.
7) You can always get a computer that's way out of your league with some money. You can't do that legally with girls.
8) Don't have to remember their birthdays.
9) No fights, just a quick BSOD and you can restart to a new leaf.
10) Computers give you thousands of hours of satisfaction anytime you please. Where a girl will only if you're lucky.