The data is showing portal transfers growing with the onset of NIL. While not 100% of the kids transfer for the money I would expect the majority are leaving for the money. Why else is there an NIL database? Are you aware of anyone leaving for less NIL money?
I am willing to bet that pretty much everyone who transfers from a huge program to somewhere like us is going to get less money, and pretty much everyone who goes G5 to P4 will get more money. Are those P4 kids making the move to G5 to get less money? No, that makes zero sense. They are moving because they were sitting on the bench and may get playing time in a G5 to prove themselves.
On the other end, the excellent G5 players move to get more exposure and better chances of drafting and the other very obvious benefits of playing against better competition, having scouts at every practice and every game, being on national TV, which also comes with more money because the P4 need to compete with other P4 schools trying to get the same player. The money is a big factor in a kids decision between peers, not when it is obvious that the move should be made.
If moving into and out of the P5 was about money, UConn would get zero P5 transfers, as a bench sitter in SEC or Michigan gets paid more than anyone at UConn. Joly would have transferred if the NIL existed or not.