Because —like many Kickstarters— they want paying for their time before they do the work. I'm sure they don't need to do that but if you've already got the fol

Because —like many Kickstarters— they want paying for their time before they do the work. I'm sure they don't need to do that but if you've already got the following to allow it, why not take the opportunity to ramp up the buzz? It also puts some focus on the much-ignored professional versions. Most people have been happy to use the free versions. This draws attention to the fact that designing things takes time and that is worth something.