Actually, for me, the WooThemes Playground was what got me to purchase a theme. The Playground lets you try out all of the the themes WooThemes sales for free on a temporary hosted WordPress blog on their site. If you like what you made, you can just copy the export code, buy the theme and put it on your site, then import your code from before. Works great, and was what pushed me to finally buy a theme from them.<p>I think the moral of the story with this is, you should always have a way for potential customers to really try out your product before they buy it. For many, it may get them to buy when otherwise they might have waited out.