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RE: Is blogging on Steemit profitable? How much should you earn to be "better" than average?
It is not just about it working. It’s also about persuading some train company to buy it. That would be hard.
I think selling fast food would make more money.
That is a good objection. If I had to market such a system, I wouldn't go to the train company, but to interest groups or ideally parents who have lost their children in such a terrible way. This is of course not the high road, but emotionalizing seems to be working quite well these days.
On the business end, I guess it depends on how many patents you hold for it and how reliable it is to include an insurance to the product. Companies like zero risk when buying something.
But, I'm probably overthinking this again. Selling burgers might really be the better - and faster and safer - way into making money;-)