You are missing something else: you followed the race to the bottom. You knew exactly what you wanted and nothing else can substitute (correct me if I'm wrong, but I doubt anyone else who makes a TPM that will fit your motherboard). Your only consideration is price and fast shipping - there isn't much for anyone to compete on and so only the largest will.

In the more typical case these is. I recently needed a compass (my son is in scouts), what do I know about a compass: not much. Amazon will give me hundreds of options, some good, some really bad: I'd have to buy the one expensive name brand I know (and hope they are still as good as they were when I was a kid), or risk buying junk - worse junk in a way I wouldn't recognize in time to return it. However I found a small niche orienteering suppler that knows their product and so was able to direct me to a brand I've never heard of that while not as good as the name bring, was both a lot cheaper and good enough. They beat the race to the bottom because for a slightly higher price than amazon they could deliver me the exact thing I need for a still reasonable price.