Your very close Scotto. I run the cheapest of the hi-output batteries I can get & a single pack for a heat race is in the $600 range.
I hate writing the numbers, as I start to realize i could out-fit my motorcrossers with factory suspensions for the amount of miney ive burned playing with e-bikes.....I rationalize it as educational LOL! (I am a jr ellectronics engineer now)
is it worth it? I don't know.
For a leagle street bike with 30+ mile range & a top speed of 30mph...your going to spend a grand. + the time investment to learn how to take care of your stuff safely. I threw out $200 worth of batteries that died from neglect last week
(no pre-assembled kit will get you any where near that price or range)