Never understood why people use usertesting.com vs. mechanical turk for the same thing? With Turk you can pay turkers way less.. get lots more results & run ma

Never understood why people use usertesting.com vs. mechanical turk for the same thing? With Turk you can pay turkers way less.. get lots more results & run many successful user tests. You just have the turkers download and install a screen record browser extension, go through list of questions/tasks while their recording and submit their screen records to get paid.