We're likely a really small subset of these people's audience, tbh. You guys overestimate how coomer-brained and dumb some people are. For every guy finding her shit for free, there's likely more buying her stuff for the first time. She doesn't need everyone to be a whale, but having new influx of people joining and buying consistently makes OF models money. Some of them are big catches, others are gonna be let go. That's why they and other consumer based stuff put out sales. Lowering the barrier of entry increases the number of buyers and the chances of getting people that'll spend a lot for a short amount of time, decent amount of time, or in the case of whales, a very long amount of time.
You can find this shit for free obviously, but people are going to watch specific creators, specific cosplays, and even if it's already available on sites like this, they probably don't know how to access it. I've seen a shit ton of people that still don't know what/how to use adblock for fuck's sake