Welcome to reality. Your refusal to accept what you term as "predatory behaviour", at the moment, is coming close to refusal to accept any positive facts about the kit and how it can be used. The list of vendors were those that I should have a similar amount of vitriol should I take a similar stance to you ... but reality says that most of us have to work with these companies anyway. That doesn't mean you don't challenge them. Some you win and some you lose ... sometimes it depends on how badly you feel about whether your integrity needs to be kept intact or whether your are doing it out of blind hatred.
What is wrong of a little healthy dislike of various vendors, nowhere did I say that I did not have a chunk of dislike for most of the vendors that you list (the ones I have dealt with/heard of). Why should I just lie back and accept the preditory behaviour of these companies. It is everyone simply accepting this as the status quo that is the reason they can get away with as much as they do.
Welcome to reality, if they treat you badly complain and look for better solutions, if you don't you are propogating the problem by rewarding and accepting their behaviour.