As Dr. Wyman stated, odds are at play as well. I’ve produced several clutches out of a pair of 100% hets before I actually hit a visual. It can be a long arduous process to truly prove an animal out, and of course consider that the majority of dinkers will not prove to be anything special.
3 years ago a funky looking normal I have produced a male photo copy of herself in a clutch with other obvious normals. Most likely she’s just a forgotten or lost het of some sort. When I finally solve this mystery it will be purely for my personal pleasure, I will have spent more money and time on it than it could possibly pay me back. A few years of food, missing out on her normal clutch production, heat, rack space, etc. and what I’m most likely to learn is that she’s het for a $300 recessive gene that I already have. To top it off, if I don’t see any visual genes it still doesn’t necessarily mean something isn’t going on, and I get to repeat the whole process. This could go on for a couple more years even, and end in eventually discovering that nothing is going on and she just makes two obviously different phenos of normal lol.
My point is, if you’re going to do it, do it for fun. The investment is going to be hard to recoup in most cases.