Since you asked, figuring he's a bi-coastal guy (NY/Silicon Valley), and seeing she is not staying at 5 star hotels (Four Seasons/RCarlton etc.) I'd say she's on a monthly scholarship of 5 - 8K a month, which gets him 3-4 weekends a month. She also (likely) has the liberty to see other SDs. She probably has more than one (most do). She's not locked down since she's still advertising herself on IG and not mentioning any "amazing BF".
If you guys are really interested Moon Maison posted a really accurate post on the whole arrangement vs. SB/SD vs. escort thing - as she's lived that life since we was stripping and escorting since age 18. BTW Mari is now shooting with all the same "photogs" as Moon. Birds of a feather…
Most guys don't know how common this has become. The dead giveaway is the weekly trips, the 300/person dinners at the elite restaurants, exotic vacations (while a student), expensive lingerie. Yeah, guys who play at that level do not have time to fuck around and so they guarantee their time is well spent.