I agree, some work on CodeCanyon is undervalued compared to how many hours it takes to design and code the scripts. However, maximising sales could ofcourse compensate alot for this, or the percetage CodeCanyon takes could be lower also .
A freelancer could charge a few hundred for a script, whereas on here, for the coder, he/she will get $3/$5 average for their script.
It still a good way to sell scripts though , abit of teaking with some of the pages would be useful. I’ve sent suggestions/bugs a week or so ago, but still here.