Here’s the thing-I would love for this service to be free or easily affordable. The more people using it, the better it works! When there are more people using it, there are more possibilities of people cancelling FPS and other people searching or refreshing can pick up FPS with a sooner return time; similar to WDW. When there are less people, less cancellations and more likely to just get a FP with a “normal” return time. I noticed that when I used Maxpass (it came with my AP) during busy days at Christmas/Halloween, I was able to get great passes with occasional immediate return times. But when I’ve visited during lesser crowd times, even with refreshing a bunch, it keeps the same FP time availability.
This is definitely in opposition to someone getting FPS without Maxpass. When it’s busier it’s more likely they will be stuck with a later return time, plus passes running out sooner. But lower crowd times will allow sooner return times and longer time before they run out.