There are a lot of true e-motorcycles that are quite a bit faster than 30mph, but these need tags, registration, same as a gas motorbike.

ZERO MOTORCYCLES ? The Electric Motorcycle Company - Official Site (SR is 100+mph, 10k to 17-18k)
Buy Brammo (10k to 19k, but some as low as 8k for 60-70mph)

I like the Stormers or the Specialized Turbo, but 3-6k for a bike with Sora-level components is hard to swallow. If the major bicycle manufacturers can come down into the 1-2k range, then that is completely different matter! (I am discounting the kits, as there I don't have the time or skills