You can sell a GPL product. You just have to make the source available for cost or less (ie price of P&P and handling, etc).

Thats hardly too demanding and if you are selling to beginners won't hit your sales too badly while at the same time you get the benefits of more experienced users downloading it and using it themselves and possibly giving feedback.

Bare in mind there is plenty of second-rate delphi, visual basic and even perl commerical software available. Are you sure you want to add to that?