Ouch… no matter what people have said to you in other threads I don’t think that was called for here. Nobody is being rude to you, or deliberately saying anything to offend you. Obviously the whole business has made you feel frustrated but unfairly lashing out against “young folks” isn’t helping anyone.
I don’t think anybody here has made any immature or unreasonable comments on your invention. I realise you’re probably selling these below cost when taking into account what you could make by spending the same amount of time on your day job. Obviously charging less wouldn’t make much sense, unless you’re trying to cut your losses financially.
The comments about price are feedback from potential customers. I don’t believe they’re saying you should work for free, they’re saying they can’t afford your product. It’s feedback. If you could find a cheaper way of building cranks - maybe a more limited design - maybe they’d be able to buy it. But that probably doesn’t matter right now, because for the Crazy Arm Cranks they probably aren’t in that market segment anyhow.
The main use I see here is fairly serious 36er riders. Folks who are seriously into distance riding and cokering typically have deeper pockets - the good kit is quite expensive. These guys can afford your work, but they’re thinner on the ground, so you’re going to see less comments from them here. it doesn’t mean they don’t exist, though.
I wouldn’t count myself as a particularly accomplished distance rider, but nevertheless I have the spare cash and am always interested in new innovations, custom work, etc. I’m prepared to shell out fairly steep prices to get something that Just Works for doing comfortable long distance / commuting / muni all on the coker. Your cranks being tool-free is a bonus that no other solutions I’ve tried have. There are plenty of folks out there who are similar to me in this respect. I’m not going to pretend I’d rush out and order your cranks straight away, I’d at least need to read some good reviews and then lust over them a bit before stumping up the cash. But they do look like something that could be good for the niche of serious Cokeurs doing varied riding.
Yes, they’ll get by - free market and all.
Here’s what I hope is a more constructive and feasible suggestion if you have any interest at all in selling some of these, or maybe just in showing people what you did. Why not finish off one set, and see if you can loan them to Uni Magazine for review. If the Uni folks find they’re good then maybe you’ll get some more interest and be able to reach a wider audience than the regular forum readers. Worst case, you’re without one set of cranks for a little while, then you get them back.
If you’re really sick of getting negative comments on your project then I understand you giving up. Internet forums are an abundant source of “stop energy” and it’s hard to make people understand what you’re trying to do and why. For the record I think the design looks potentially very interesting - and I’m speaking as a consumer, not as an engineer (because clearly your knowhow outstrips me).