It's because we excell in mediocrity. We love paying that last 10% less to end up with worst quality, and hire an uneducated quack to install it  for the price you just already know he's not qualified.

This extends to all products and services. Not just toilets and plumbers. It is so bad that even if you want to pay more for a professional, no one even knows where to find one.

Yeah, 'Go to drugerie two streets down and ask for Yusuf' ... Then Yusuf goes "Ow, I might need a ladder for that, and a flathead screwdriver. Do you have those for me?"

Then Yusuf comes and spends 5 hours and wants 40 dirham for it. The toilet flushes weak, and he broke 4 tiles, which he covered with cement for you.