Yes, the price comparison does make it look better value by far. But then you look at the production methods and volumes and it isn't hard to see where the price differential comes from. I've been inside the Derby Toyota plant a few years ago, where they're churning out 3,000 cars a week, it isn't like Ford's Dagenham plant in the 80's where I also visited (Well worked, but we were on strike so much I only ever felt like a visitor)
Maybe if when the E-Bike market is big enough to attract the likes of Honda, the unit price will drop. Until then I think the right comparison is with bikes of the same quality, take away the battery cost and that seems to be around +40% or +60%* with the battery, that doesn't seem unreasonable to me. When you look at the conversion kits, they only make sense if you already have the bike, if they were so overpriced it'd be a more competitive market.
* Feel free to test that theory out for yourself, look at the current new price of those two bikes you've sold and the electric bikes available for 40% - 60% more.