Subscriber similar to game pass on xbox
Offer different levels of subscription based gameplay. Offer one package that allows you to play certain games within a certain tier system for a lesser yearly price. Than offer more popular games at a slightly higher price and then your most popular games at the platinum package rate which should still be reasonable and affordable to all. This way, everyone wins. Games get played, developers an Facebook gets paid, and the store becomes more expansive rather than restricted base on cost of each game being an issue.