Interesting, as I was engaged in a conversation about this earlier today.
There are definitely breeders out there who stray from the breed standards who are excellent breeders, paying a great deal of attention to their cats and kittens. Their cats of course wouldn't show well as they stray from breed standards while still producing stunning cats, perhaps beyond what the breed standard says is appropriate. For instance a marbled Savannah wouldn't show well despite being an absolutely beautiful cat.
My personal criteria when searching for a Savannah was all about personality. I didn't have any care for the wrapper, despite ending up with a classic example of a Savannah. It was a painstaking journey as many breeders went into great detail about the wrapper, and only a few could really tell me about the kitten that was inside.
Anyway, length of time in business as a Savannah breeder, cat breeder and my gut was a better qualifier for me. The cat show participation wasn't on my radar and wouldn't be today. I have a great deal of appreciation for what breeders do and understand the level of commitment it takes for people to show their cats. It just doesn't enter into my decision making process and I'm sure quite a few others.