I'm negotiating about selling non-exlusive (I'll keep selling them) resale rights for some of my vector images to a small, but pretty old stock vector company. They like to buy them in sets of 50 vectors.
They are mostly simple images, like these:
http://www.shutterstock.com/pic-228932677/stock-vector-blue-penrose-triangle-technology-company-symbol-design-set.html
http://www.shutterstock.com/pic-210234994/stock-vector-lavender-twirl-pattern-background-vector-version.html


For how much should I sell them?
I'm thinking about $2-$5 per image.

What's your opinions?

I've made a website that analyze keywords that ShutterStock customers potentially use in their searches:
http://www.stockkeyword.com/

FEATURES:
-This is a free online tool.
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-More than 3000 keywords already analyzed. Currently I add few hundred new keywords daily.
-The site provides data for the first 100 search results for every keyword.
-all images/photos/illustrations/vectors  and  popular/relevant searches
-The data shows competition factors and potential sale opportunities for each keyword.
-Each keyword page also shows the most important related keywords for every keyword. This way, it's easy to find the best keywords for your images.
-You can find new keyword ideas, that have great "estimated sale factor" and/or big "low competition factor".
-You can view all the keywords of the top 50 images on one page - it also helps proper keywording.
-Average and newest ID shows whether it's possible to get a new image into the first page for a given keyword, or it's reserved for ancient images. (low ID means old image)
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If You're interested in a given keyword(s), reply to this post, and I'll add it/them in a few days!