OF should have a rating system. Like the users can rate performer from 1 to 5 stars and this rating will be public. Then they should also have a like and dislike button on every unlockables allowing people who purchased it to rate it. Then have that info displayed below the unlockables. This will let the users know that "Model A" has an unlockable but so far the amount of people who unlocked it and liked it (in comparison of the people who disliked it) is 27%. This allow users to know if the quality of service is good or not. Also, allowing paying users to overall rate a performer 1 to 5 stars forces the performer to provide good content. Just like Uber