To geld or not, is such an individual decision. However, I am sure we all see tons of whole colts and stallions out there being bred, who should have been gelded. And this in every breed. However, I am also sure we see just as many mares being bred, who are far from breeding quality. How many of us actually spay our not-so-good mares? Very few I suspect, even if we geld our colts.
Many vets do seem to charge more for gelding Minis, than they do for large breed horses. In S. California, our vet bills for anything, most usually exceed those charges in other states. With Mini prices having dropped so much in the last couple of years, I can well understand that in many cases, gelding charges would exceed the money we might be able to ask for the colt. It's sort of a case that you are darned if you do and darned if you don't. Just bringing a foal to saleable age, isn't cheap. If one has paid a stud fee, then the cost exponentially rises. The breeder will seldom break even, let alone make any type of a profit. There again, few of us went into horses and breeding, with the thought we would make money. I would shudder to think of the money I have put into animals, over my lifetime.
Over the years, my daughter and I have gelded the majority of colts before sale. A few we thought would be outstanding, were left whole. Would some we gelded, have turned out to be wonderful examples of their breed? Probably, but at least we know that they are not living life as many lonely stallions or being bred to death to mares of iffy quality. And we all know, that most still will blame the sire, if offspring don't turn out very well. I also think that owners mostly tend to do more with geldings and regardless of breed, they are easier to deal with on the whole.
Selling with a gelding contract helps a little, but it never means that a colt will not be bred in the future. So in the end, it is always up to the individual breeder, as to whether he/she gelds or not.
Regarding showing. I do think it is lovely if we can afford to show our horses. Not all can obviously. I wouldn't purchase a stallion or breed to one, purely on a show record. I'd choose a quality horse over one which I felt maybe didn't deserve his show wins, any time.
Lizzie