i think makes zero sense that half her instagram subs would spend money on OF, for me the math is inverse of what you saying, i think 10% of her subs wouldnt interage at all with her posts (giving likes, voting on polls, commenting) thats why since when she is in a high moment with her content in all her career the max that she got was 1.6k likes or interations thats why for me she can only get at max 2k subs in her best moments
other thing is in her PPV she made almost 50k , with a price of 69 doing a rough math that make less than 100 peoplo bought it, so if she had 5k subs like you said it would be a "bomb" and would not make sense that she said that most her subs said that wanted for her to continue to do it