the GOAL of matching was NOT to harm or be harmed. the GOAL was to prove gameness the violence & injury were a necessary risk in order to achieve the goal.
I don't think it's important to fight dogs for money to preserve the breed. Personally I'm against it. However I think the breed will suffer an unfortunate change without game testing. Believe it or not, it's not just a pit bull thing. In countries where dogs are still important to the livelihoods of many people, many dogs are tested against one another to determine their tenacity and unwillingness to give up. They're tested once. They don't have to undergo three, five or more severe beatings with money on the line to prove that that have they are good enough to be bred.
I don't think a dog has to be dead game to be a good example of the breed. But game testing is a good way to show that your dog can handle the heat. A dog that gives up at the first sign of discomfort is not a good example of the breed. Game testing a dog, once, for no reason other than to determine whether your dog is a rank cur or not, no money or glory on the line, would be a valuable tool for helping to evaluate your stock, were it legal.