I'm surprised no one with an eye towards reducing the number/variety of such tools has inflicted an intentional App Store-style price race to the bottom by creating such a tool, preferably a superior one, and selling it well under cost (e.g. $1.00) to make it unprofitable to develop them. Might take multiple "competing" tools to cause this to occur, of course, and at some point they'd want to stop supplying their tools.

Of course, your $100 price might be a figure pulled out of thin air, not an accurate one.