If you want to mix it all up, feel free.
WU is happy to do that because they’re screwing you on both ends, may as well put it all in one pile.
Me, I would not charge nearly that far above the blue rate.
Today’s rate was about 66, 75 sounds outrageously high.
If you want to do that and find takers, power to you.
I would note, though, that people with pesos here usually know how things work here.
They are also, generally speaking, neither stupid nor in a hurry to part with their money.