The only issue I have with this, and most likely others as well, is the determination of where the cutoff point is. If someone makes an AIO Wooductter and sells it for $10, only to be undercut by someone else for $8, their obviously going to lower their price to sub $8 to start competing. Now someone else comes and undercuts, existing scripters cut their prices, someone else comes, etc.
Price wars in the long run help no one, which is why you don't see big companies lower their prices just because someone else comes into the market. They gain their sales through reputation and advertising, the same kind of thing we should be doing.
The only reason someone would want a low script price is 1) they really just want to help out users (which is bullshit because if they actually cared they would make it free) 2) their script sucks and they want sales or 3) they don't have the necessary script features to keep up with scripts in the same category as them.