I had a batch of fish, freshwater, that I brought back from college in Maryland, to Oklahoma, in tubs. I sat, totally cramped, in the back seat of the car, using a hand squeeze bulb to aerate those tubs all the way: used a plugin air pump at night in motels, repeat, for 3 days on the road. {Yep, this has a bad ending.} I set up beautiful new planted tanks when I got to my new residence. Everything ready for them to go in. Went to a movie with friends I hadn't seen in a long time...came back and the air hose connection had slipped. They all were dead. Big mated angels, all the rest.
I'm still at this, some few decades later. You can stop for a while, but the sound of water sort of gets into your head, and you're back.
So sorry for your loss. And by all you say, it wasn't really the money in your case, I think, but the high personal investment of hope in the fish. I say keep at it. The joy you get will outweigh it.