Here is my impression of code canyon… most devs would be better off building their own site for selling their code (not true for themeforest and themes).

Look at gravityforms, ninjaforms, popup domination, eventespresso etc.

I think if I were going to focus on wordpress analytics (assuming from your post). I would build a free plugin that had paid components as add ons all revolving around analytics.

See --> http://www.wpbeginner.com/opinion/is-this-the-future-product...