Why does it matter?
If you want to look at it that way, why would you mod a blaster either? It's not like they're the best thing on the market right now. Are you just saying that everybody should buy a 400, 450, or raptor 700 if they want to go faster?
I for one would rather be different than every other guy on the track or trails. Sure, I could buy a z400 or yfz or something like that, and it would be better than a warrior right out of the box, but here's what you might not understand if you've never had this pleasure before. I for one greatly enjoy the look on the dude's face when you blow past his 400 on "just an old warrior." Over the summer I had one of the neighbors all worked up because he had a brand new ltz450 and couldn't keep up with me in the trails. It's not just what machine you have, it's how you set it up and how you use it for the conditions you're facing.
To me it certainly isn't an issue of money. If I wanted to be like everyone else and buy a new quad I could go to any dealer right now and buy any quad on the floor in cash. I think it's pretty cool when just about everybody that sees my warrior when we go riding or are anywhere else tells me it's the nicest warrior they ever saw.