By much you mean the weight of the motor, which actually is not the main weight of the bike. Batteries tend to be removable or easy to gut.
The frames may sometimes be a bit more heavy duty, but usually aren't.
The motor is noticeable on a super light carbon bike but not really on aluminum and definitely not on steel frame.
5-10 times more expensive is also a lie, at most I've seen 2x over comparable non-electric. (Though instead it should be a flat price increase.)
Thing is, many ebikes are in premium segment. But there are many cheap ones as well.
It's not just the motor. The frame gets beefed up to handle the higher forces. Generally wheels also get stronger, as does the drivetrain.
The main weight penalty is the frame though.
As for price, I got a decent normal bike around 600, and would expect to pay 3000 for an equivalent e-bike. For the 10x I did conflate e-bikes with 'speed pedelecs' which are not really bicycles anymore.
The frames may sometimes be a bit more heavy duty, but usually aren't.
The motor is noticeable on a super light carbon bike but not really on aluminum and definitely not on steel frame.
5-10 times more expensive is also a lie, at most I've seen 2x over comparable non-electric. (Though instead it should be a flat price increase.) Thing is, many ebikes are in premium segment. But there are many cheap ones as well.