Every idea is vaporware at some point, it's not like we can think of something and magically it appears.
I agree, but you don't go on stage and start selling your idea before it's implemented.
We aren't talking about shares in a company here, we are talking about currency.
1) idea
2) write & code
3) peer review & test
4) implement
5) tell people about it
Don't start telling people about your idea (and try to get them to buy/pump your coin) before even releasing a paper.