Most albino creatures aren't blind to start with. They go blind due to sunlight (UV light) damaging the eyes. If the person, animal, bird, etc is kept out of direct sunlight, they don't normally go blind.
Bettas are normally bred in tropical Asia where there is lots of UV light and this would damage the albino's eyes very quickly.
Something the OP could do is breed the albino male with a white female and keep them out of sunlight, then see what the young are like. It's probable you would get some white males with dark eyes as well as more albinos. These could then be used for a breeding program and experiment to see if they go blind after a period of time due to genetics, or if it is the UV/ sunlight causing them to go blind.
Either way there would be a market for pure white males with dark eyes or even albinos.