I could imagine paying even up to $100+ but only for niche use-cases (finance data, fiding experts/employees). I would like ability to create plugins for search

I could imagine paying even up to $100+ but only for niche use-cases (finance data, fiding experts/employees). I would like ability to create plugins for search usecases and for example take 20% cut, basically allow for search app store. I wonder if it would work.