You purchased something off ebay, that was cheap.
There are plenty of laser cutters in each state that you can physically go down and talk too, ask them about quality, see their work.
I mean come on, "you asked why it was so hard to get good stuff", yet in the same post turns out you purchased it blindly off the internet.
Hell you don't even know if it was made here and the likelyhood it was, is slim. Its common sense.
People answered your issue and told you that you to spend money in most instances to get decent stuff
And then you get all emo about it? Odd
It's no different to buying a cheap materials/fittings for your house or something. Half the time they don't line up or they fail and you curse, takes time to fix and so on.