Non-coaligned priests require more money in donations than coaligned priests do to get the same benefits.

An orc shaman behaves as the temple priest in Orcish Town (possibly even having an epri struct attached so that it tends the altar). If you pacify it, you can donate to it as you would a normal temple priest.

Priest characters can sacrifice gold at a coaligned altar for identical benefits as they would get from donating to a priest. The altar does not have to be attended.

You can offer gold on a coaligned altar as well as giving it to a priest. This gives you a different, weaker, variety of benefits if there is no priest present (and the same ones if there is a priest present). When you do donate to a priest, they offer the gold themselves in a burst of light (which deletes the gold, preventing you from killing them or stealing to recoup it).

Donating more than 100 gold to a priest but still less than the required threshold to actually get anything causes the priest to say something gracious, rather than “Cheapskate”.

The more gold you pay to a priest, the stronger his god becomes. Newly generated priests of that god could get better equipment, or altars of that god might be harder to convert. In Moloch’s case, Gehennom gets slightly harder if you pour a lot of gold into his temple. This applies with money donated to your own god as well, but the effects are naturally less visible since you won’t go around fighting your own priests or converting your own altars.

Temple priests can sell holy water as a donation benefit.

A YAFM when you donate exactly 1/10 of your gold to a priest: “You pay your tithe.”

Permanent alignment conversion prevents you from receiving any more protection by donating to a priest ever again.

The cost for buying protection is based on your maximum level reached, not your current level, to prevent draining for gain.

It costs more money to donate to crossaligned priests for protection.