Honestly it doesn't make sense to me that traditional motorcycle dealers would carry Zero with lower sale margins and service revenues (and often without in-house technical expertise).
The Hollywood Electrics' seems a much better business model, and it shows. It's ludicrous that it's easier to get Zero parts/accessories from HE than from Bay Area dealers a few miles away from the factory!
Hollywood Electrics definitely provides a better customer experience, but this hinges on Harlan having a very good pro-active relationship with Zero.
Also, I'm not sure that one can take Hollywood Electrics' business model for granted. The fact that they picked up the Ubco 2x2 and have generally tried to diversify over the years suggests that they'd feel more secure without having to rely on Zero so strongly for servicing revenue, because (from what I've gleaned) Zero's dealership sales and servicing deals aren't exactly generous.
I don't think the Energica relationships are any better except by the investors pouring money into it, and Brammo sales were definitely terrible, so all I can say is that no one knows how to do this sustainably yet, and the economy is still broken, so try not to be a pain for anybody involved, please.