Well, yes, you're actually making my point.
You're giving Aweenas absolutely no reason to stop doing this. He made a great deal of money off you.
So while you saved those 2 fish, you sentenced many, many more to coming into existence - why bother breeding healthy fish when people will pay you what is well more then a day's wages for poor ones?
It is easier to raise poor quality fish (or anything and any job)then to do it well. So if you get equally rewarded for doing it the wrong (but easy) way, as for doing it the right (but harder) way - why would you give yourself more work?
If I asked you to dig me a ditch, and told you I'd pay you $500 to do it, and handed you a shovel and the keys to a backhoe - would you use the shovel?
You see, it's not just genetics that create fish that need "rescuing". It is very much care. Poor water quality, inadequate nutrition, overcrowding, temp spikes - all of these can alter and stunt the development of fish, and all of these are conditions that take WORK by someone to overcome.
Why should someone bother working, if someone's going to pay them just the same for not? Backhoe and shovel - people will always take the easiest path.
When you pay money to "rescue" a fish - you're not rescueing it, you're buying it, and that's paying someone for the job they did. You are saying to that person - "Go ahead and raise more fish in poor conditions. You don't have to bother taking pride in it, doing it right, caring, any of it. I'll pay you to not bother."
And so they will, creating more and More and MORE creatures that need saving.