On the real... the problem with payed verses is, that just like every other facet of Hip-Hop, the market is waaaay too glutted. See... I think the problem is that Cats are too loose with game these days. I don't know if it's because niggaz is on some guilt trip about being labeled haters or what, but all game isn't FOR everybody. Entertainment is a business. There are some business strategies that you need to be kept under your hat. If you have a good business idea, keep it to yourself for awhile. Seriously, you'd be doing the rap game a favor, cause a lot of the people doing the glutting would never have even attempted to release the junk they have, or even have the confidence to spend their hard earned money on a fool's dream if they weren't under the misguided perception that this is a "paint by by the numbers" business.
Loose lips about solid game only empowers the feeble minded and untalented into believing that they too can achieve greatness. Don't get it twisted, you're not a hater cause you keep good game to yourself. In reality the glutters are the true haters... they hear or read somewhere the story of someone (who from nothing truly took the time and effort to build a career in this game) and say to themselves, "Damn! If THAT nigga could do it, then SURELY I can!". Then proceed to emulate the exact process (that at one time actually was unique and could actually generate sales) to the LETTER.
The morals of the story: Never help to create your own competition, never give away free what you yourself have worked your ass off to achieve or accomplish, and your trade business secrets and practices should be like your Momma's sex life... somethin' you just don't talk about...
Now to show you that I'm not a hater just trolling the siccness lookin' for shit to talk. I'll answer the question in the spirit it was asked... not only that, I'll even break my own rule of keeping good game to myself...
So how much would I pay an established artist for a verse? Not a fuckin' dime. But hey thats just me. I tell you what I WOULD pay a truly established artist to do... and that would be to put one of MY verses on HIS album. See, if you really want to get some exposure, THAT is what you would REALLY want spend your hard earned money on. Instead of paying a Cat 10 racks to spit a couple of verses on YOUR album and praying that those few lines are gonna be fire enough to get you enough exposure to help you sell some units to HIS fan base, go directly to the well to get your water and you'll get an entire album worth of verses that he undoubtedly believes are his BEST material. His fans will wonder "who is this guy that my favorite rapper thinks enough of, to put on his OWN album?". If your shit is genuinely tight, I GUARANTEE you that his fans will be more likely remember to look for you, or even know of you, this way.... than the other way around.
And so I'll leave you all the way I found you with one final thought....They call it the "Entertainment BUSINESS" for a REASON. Try taking some time to step YOUR business game up. And oh yeah... stop spendin' so much time fakin' it, and more time makin' it...