What I proposed is $30 / month for subscription to buy assets not for a license to use them. If you don’t pay the subscription you can’t buy the assets. Then the maximum price that sellers would be able to set should be $99 and whatever you buy the license is yours to keep. The subscription would need to be paid to unlock the buy button. Like some sort of exclusive club option. If you don’t pay the monthly fee you can’t access to buy the assets. And even if there was a clause to pay 3 months straight it would still boost sales due to the enforcement of $99 maximum assets price.