Pixmac Now Offers More Than 400000 Vector Images!
I-Newswire.com (press release)
Pixmac, the picture market. An innovative microstock agency offering more than 10 million royalty free jpg and vector images and illustrations.

If you're an artist, create vectors--they sell well and if they are sufficiently detailed, some microstock sites will tag them as more expensive downloads--meaning more money to you. Selling vector images at Shutterstock means working within the (essentially) all-you-can-eat package--which can also mean many, many downloads.