Just wanted to know something

Hey,

I wanted to sell my sig links on DP and no one was really interested, even though I post around 10 times per day and have around 450 posts...

What I wanted to know was, how come I see people with 300 posts with their sigs full of colorful links that looked like they have been paid for?

 

I guess most of them just put their own urls there.And some have sold their sigs to other people.