Those are all good points....

Another factor to throw in is the wear and tear on the compressor.
How often does the compressor need to be replaced and how much does
that cost. You'd have to save a lot of oil to cover the $250 inital
cost plus wear and tear on your A/C system.

There used to be a funny ad in Phoenix regarding heat pumps (yep we
needed heat in Phoenix in the winter)

it's a pumpin in the sumer and it's a pumpin in the winter until it
pumps its little guts out.