Ok, but then if we are using Schutzhund people as an example, they are probably not very likely to S/N, right? So it's kind of a moot point anyway, in that case.
No I think what OP brought up was that for some reason to be "responsible" the Schutzhund people make the decision to rehome, and get the dog altered, not realizing that they've just decreased their chances to find this dog a Schutzhund home.
So say a high level competitor has a dog, it doesn't work out, he wants to rehome, he alters the dog. Now...this would be a great dog for a mid-level competitor, but the mid-level competitor now doesn't want the dog, only because its altered.
I think the problem is that although an altered dog would find a pet home much quicker, its harder for these dogs to find those homes. And I know people have done it, but that doesn't make the exception the rule. So an altered dog would be more likely to find a home in an agility household...problem is, Schutzhund people don't talk to agility people, so their best bet is to look for another Schutzhund home.
Just a note on that comment...my GSD club holds an agility trial every year. 300 runs a day that will be increased to 600 runs a day this year. We were booked solid...and there were 3 GSDs there. Now, I've started training in agility so I'll be there next year, and we have a few other green dogs that will be ready to go by August, but in general the agility crowd isn't looking for GSDs.