Yesterday I bought 6x$250 on my account to get the $1500 spend bonus. Then I tried to do 6x$250 on p2's account, and I got a notice that I could only spend $500 more due to the $2k limit (how did they know I'm p1 not p2? No idea). So I bought 2x$250.
Anyway, today I was able to buy the remaining 4x$250 on p2's account no problem. It suggests to me that $2k is maybe a daily limit now? Any ideas?