Sure vectors sell better than photos. Generally speaking, anyway. But like anything else you have to know what you're doing. Do you have any experience creating illustrations, web design elements, buttons, etc.?

You might want to try vectorstock first. When you get some sales there, you can try to get accepted at shutterstock.

Then get a passport and join shutterstock, vectorstock is a joke with almost all vectors at one credit.

Be sure to check the most popular agencies' sites to see what is being submitted ("New"), and what is selling ("Most Popular"). Do your market research. As a buyer, lately I am seeing a LOT of "buttons" and "icons" flooding the market, of very poor quality, making it about impossible to find anything good or original, it's making me tend to not want to buy icons or buttons, to find an alternative graphic for my use.

As an artist my vectors do make more money than my photographs, however I have been doing this a long time, I have a degree in commercial art, and I don't pander to the "quantity over quality" debate, I just do quality, no kind of quantity. My port is active and my images sell well after careful consideration as to what to submit. I wouldn't want my stuff to sit there and get moldy because it's just like everybody else's.

I don't recommend just opening Illustrator or Inkscape and doing a tutorial and submitting whatever it is you made from that. Practice before you submit or you will be sorely disappointed, this isn't an amateur's game.

Good luck and be sure to ask questions from the seasoned professionals here before you go it alone!

Stacey