With long distance pricing or really any sleeper, one needs to consider that the ticket price basically includes hotel as well since you’re sleeping there and they need the facilities to handle that, meals etc.

I've never looked into this. How often do they sail? I can't imagine more than weekly or even monthly. I would definitely consider it though.

It varies by time of year--but monthly in a given direction is probably a rough estimate. Go to Cunard. Mostly Queen Mary 2 although I think they have a new ship that does some transatlantic as well. For crossings, my understanding is their ships with stabilizers etc. are better able to handle the North Atlantic than the average cruise ship.

Dates lined up for me on a trip late last spring and I enjoyed it. Would consider doing again.

I don't know whether QM2 or other Cunard ships have any special equipment for crossings, but pretty much all cruise ships have stabilizers. Other cruise lines also do trans-Atlantic crossings cruises when re-positioning ships between seasons.