[cloudmountain]

whatever happened to his vow of poverty?

Priests are not required to take vows of poverty. They MAY if they choose. Most don't.
Nuns and sisters are , but not priests.

I THINK that it has something to do with the longevity of the vows. Nuns/sisters can always be released from all their vows; priests, not so.

[A.A. Cunningham]

Priests are not required to take vows of poverty. They MAY if they choose. Most don't.

Religious order Priests take vows of poverty. Diocesan Priests do not. In addition, Diocesan Priests do not technically take vows. They make promises to their Bishop and his successors.

Nuns/sisters can always be released from all their vows; priests, not so.

Incorrect. Priests can indeed be released from their vows/promises by the Holy See as can be nuns and sisters. With men and women religious, it depends whether one has professed simple or final vows as to who has the authority to dispense.