Great idea !
Most software packages and plugins today come with a monthly payment and they are very popular amongst startups.
My opinion of the market ?
Too many useless mods, some of them even based on 1 mod and just copied with some changes in it and then given another name.
I love the idea of trying out before buying, it will improve vendors support.
I would rather spend 50 $ for trying out 10 mods than spending that money to buy 1 mod which I'm not sure of it will work as it's expected see more to work.
That way our feedback will be taken into account.