It would depend on what the source code had to offer. Right now Andromo is a great little tool to make some quick easy apps. The only thing Andromo is offering me, right now, that I can't do myself is the AdMobs. I can't figure out how to add them to the apps I create in Eclipse.
However, if Andromo offers the ability see how AdMobs and Menues are added to a project then it becomes a valuable learning tool that I would pay for. Better still let me add my Eclipse source code to Andromo and then add more Activities, menus and AdMobs, now THAT'S worth $99 per app!