Can I ask a question about these massage guns? Why are some of them so expensive? I wanted one but balked at paying $500 for what seemed to be little more than

Can I ask a question about these massage guns? Why are some of them so expensive? I wanted one but balked at paying $500 for what seemed to be little more than a battery powered reciprocating saw with a foam ball were the blade normally is. So I bought a knockoff for $35, just to see if it was any good… and it was! Bought it at the start of the pandemic and it’s still working fine. I’m sure the theraguns and hypervolts are better than my cheapo, but there’s just no way they are ten times better (like their price suggests).