spiros said:
If you transform your passion into a job then you finish to F..K your passion
Amberwolf you're right!!!!!
I once turned my passion for roadracing motorcycles into a decent paying job. Eventually I realized I had turned fun into work and that I had traded one boss (my immediate supervisor at my old job) for dozens (my customers).
If there is to ever be a trade group to represent the DIY or boutique builder it should be helmed and supported by those with the most skin in the game: the big importers and those who are making money supplying components to builders. However, given the legal minefield created by the 750w power limit for legal street or trail use, don't hold your breath.

It would be kind of hard to lobby in behalf of legal access if all of your products are well over the legal limit and cannot be ridden anywhere but private property or motorcycle areas, which I believe is the case with any BBSHD build to give just one example. Certainly any motor can be made legal by adjusting amps and volts in the controller, but does anyone really do this in the real world? How many 14a/52v BBSHDs are running around out there as opposed to 30a/52v setups: 1% ? 1/2% ? I have three and none of them are truly legal, this is obviously not a problem for me as an individual user, but as a trade association or lobbyist, it sure would be. It might even be an issue for a small shop getting sued by a customer......

people have expectations and when they spend a couple of thousand on something their expectations are pretty high IMHO.
As far as starting a business building ebikes, I think that warranty claims would be a prohibitive barrier unless you sold w/o one and I'm not so sure that state laws would allow that in practice. Luna has begun selling prebuilt new ebikes, but they do so without any warranty whatsoever. You can buy a warranty from them for $200 for two years which may give you an idea of what the biggest importer in the country expects it to cost based upon their own experience over the last few years. Don't forget that they buy their replacement parts at a discount not available to you, they also don't have to wait for replacements to arrive from elsewhere since they have everything in stock on hand sitting on a shelf.