Well?

to be honest, the ps3 is too expensive for me right now, and I'm not interested on 360

I was going to buy it for ff13, but I felt like saving my money

if lb2 is good maybe I'll consider

Something that rhymes with, "Death to the snobcore."

Because the bunch of wii games I wanna buy = one ps3.

So then I gots no moneys. 

I have all three but not even PS3 or 360 first,second or third company title comes even close to Nintendo's first.

I could only afford one console, so I had to go with the one that had the most games I liked. Now there are dozens of Wii and WiiWare games I don't have the time or money for, so I definitely don't have the time or money for a second console right now. With stuff like the XBox Live indie games and 3D Dot Game Heroes, both consoles finally have some stuff that can make me a little jealous, but not enough to make a 2nd console a tastier deal than 5-20 more games.

EDIT: I didn't even buy a console last generation, and I probably would've eventually purchased a used DreamCast or a PS2 if it wasn't for Wii Sports and the Wii remote.  That changed everything for me.

I got a Wii first as I usually get Nintendo systems first, I have a gaming PC, a full time job, a partner, other interests. As is, I barely have time to play everything that I want to play on the Wii.

If there is a game that I really have to play I have a good friend who will lend me his PS3 or 360 so I'm covered there. I haven't ruled out getting a PS3 at some time, for GT5 and the blu ray capabilities but I couldn't justify $500 at the moment for what is likely to be fairly limited play time.

XBox 360: Failure rate has been so high from the beginning that I simply refuse to support such shoddy hardware
PS3: E3 2006 pretty much sank it for me at launch (599 US Dollars!, shamelessly mimicking Nintendo with hacked-on motion control), but most recently, because Sony has shown a willingness to retroactively remove functionality at their discretion

This doesn't mean I don't have any beef with Nintendo, though, as their DRM policy preventing the transfer of DLC to other consoles (from, say, a white Wii to a black Wii) is hardly laudable.

Well I have both now (although i still regret getting a PS3 so "early" at least for $400), but reasoning for me was money and no loss of fun on the Wii. Obviously I wanted the 360 for other games but it really never felt like too much of a requirement until Burnout Paradise came out and my XBL buds stopped playing Halo 2 with me... curse you Halo 3 haha.

But I'd assume for a lot of people is money and necessity. Same reasoning I bet a lot of other "one system only" console owners use because there really isn't a need to own more than one. But I'm sure many of them, especially the gaming hobbyists wish they could have all of them.

Money and time issues. I can't even afford all the Wii games I want and I don't have time to play them either...I thought 2010 would be the year to get a second console but then I saw the Wii line-up. I also have DS so...

I still buy some games for my sister's PS3 though.