I have been making vector art recently and am looking into hopefully selling it either on existing websites or maybe creating my own, the website in a way would also be a portfolio and it would give me more experience in making websites and UI elements. If I were to make my own website there would be various Png versions (probably png 24) of the art at different resolutions and then a vector version.
My main question is how to save my existing vector art I have made (in Illustrator CS5) and make it available to anyone who hopefully buys it and downloads it. I was thinking I can't just let them download them the AI file because not everyone has Illustrator and if they do not everyone has the CS5 version and would a CS5 document even open in CS4 and earlier or even CS6?
When saving my existing artwork should I go back to EPS10, which is what some of the research I have done on the topic suggests and what is the process of saving as EPS10 and what are the restriction in doing so or should I just stick to illustrator and pick a version e.g. CS2 as the minimum requirement to open the art?