Well, I am not sure exactly what about them is so difficult to breed but they are, and then they take longer to wean and sometimes breeders send them off to their homes too soon and they regress needing to be hand-fed again which would be very troublesome, I definitely would not want to have to deal with that. I have seen more than a couple instances on the forum where a green rump was purchased and passed soon after being received at the new home, there diss position in general is more timid and shy , not as outgoing or Hardy so to speak as a Pacific parrotlet. But the breeder will know best, you can ask her as well too.
"In his hand is the life of every creature, and the breath of all mankind." Job 12:10