I don't know about over there, but where I live, used full suspension mountain bikes are the best deal in Ebiking. So many folks go out and spend $1K or $2K(or more) on a MTB, take it out to find out how much work it is and park it.
I look for good quality models 4 to 8 years old that have been sitting in a garage and I never have to look very long.
Here's the latest example I just bought;
'07 GT Idrive 4 4.0. The guy payed $1K for it, rode it once off road and parked it in his garage for 8 years. Then he decided to ride it to work, put nice street tires and tubes, rode it twice and decided he didn't like that either.
With 29" and 700 cc wheels being all the rage these days, nobody seems interested in bikes w/ 26" whl.s and when I responded to his ad, he jumped on my offer of $450.
Made in Taiwan, this was an entry level model, that frankly, I could trash in short order off road, but on the street the 4 inches of travel and mech. discs are awesome. And the welds and paint are first class.
If I was to go back to motorcycles, I wouldn't eschew a modern Japanese bike for a Harley hard-tail and I don't dismiss modern bicycle technology because of dogmatic thinking.
And all that nonsense about the extra maintenance and parts wearing out is just that. Maybe if a guy is putting on many 1,000's miles a year. But how many here do that?