It partially attitude problem. Because with our experience we can make it look simple to repair and the internet doesn't help as they look up parts and assume we are buying the absolutely cheapest parts. When a lot those el cheapo parts are just that; junk. Plus most end users are always thinking we are trying to rip them off because of all the el cheapo stuff out there.
On top most end users are simply not educated on what it takes to run a business as they have only worked as employees, never as a business owner. There is a lot of expenses they never see that must taken into account in our pricing.
I get equipment where the owners have brought after market parts that simply don't work. And some those fly by night shops are doing the same thing.
It so easier to the job right the first time. But some thinks if they just get by using these non compatible then they made it.
I got one customer that came in last year where he brought a mower from a known bad shop. That shop rigged the deck up to work well enough to get his money. I had go back and install the correct parts so the customer could have a reliable mower. Wrong idler pulleys and a polyester belt just don't cut it.