Then what is your solution. Get ripped off with much less quality stones? Doesn’t make sense to me. Just saying.
I don't think it's a matter of getting ripped off. (Though one can be, I suppose, if they were not inclined to do their homework.)
But the matter is one of degree, largely. In bench stones, you can accomplish much the same result with Ultra Sharp, DMT and Atoma, by way of example...but the quality of the stone, durability, level of finish and the efficiency may vary from one to the other.
With the smaller stones for the sharpening rigs, you will definitely pay more for "boutique" hones, (bonded diamond, Shapton Glass and the like), which are cut and sized to fit those systems and come from high end sources...large or small. In a few instances, you can get more pedestrian prices...such as with various plated diamond or SiC / AlOx hones of the proper dimensions.
Just depends on wants, needs, and budget. There are many roads to Dublin as a wise man I know likes to say.
It's not simply one or the other. The answers are more nuanced.