I want to convert my bike to electric, so I've been looking into the legal stuff. Doesn't seem like there's any obstacles so far. And there's plenty of electric

I want to convert my bike to electric, so I've been looking into the legal stuff. Doesn't seem like there's any obstacles so far. And there's plenty of electric cars around, I'm thinking a motorcycle would be the same, but I'm not 100% sure. Also thinking of starting a local business on this, surprisingly no one else is doing it, so there's got to be a catch somewhere. E-bikes sell for 2400+ Euros, how is that even possible. A good one could be built for ~1000-1500 at most, which still leaves enough room for a lower price and a profit from the (little tbf) research I've done.