lol…I wont even get into why everyone doesnt have a steel roof.
But you get what you pay for. Exposed fastener systems are prone to leaks more than a snap lock type of panel. The fasteners tend to back out of the anchor points and the only waterproofing u have around the fastener is a neoprene washer.
Also GOOD metal roof systems cost about 3x more installed then a very basic flat roof system.
I could go on and on but you seem pretty happy you only had to spend $500 bux. So I will let you be happy.