> instead because you have to pay This is the thing, you don't actually have to pay to get "a" suitable trashcan. You do have to pay to get that exact one and

> instead because you have to pay This is the thing, you don't actually have to pay to get "a" suitable trashcan. You do have to pay to get that exact one and be able to prove it. Certifications, approvals and so on carry significant costs. And significant benefits, like making aviation extremely safe, and standardisation allowing interchangeability and cooperation. When the system ossifies over time, plenty of people are more than happy to simply follow the rules in their silos rather than think about whether there's a better way. And, indeed, this sometimes is the best way rather than doing something clever, expedient and inventive that gets your name included in a NTSB report in 15 years' time.