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I agree on the overheads - Workshop based models can work if the overheads are low - i.e non high street location, and word of mouth/reviews are good.
We've seen a steady increase in E-Bike sales, they seem to be either a fun + 1 for people who own lots of bikes, or a decent commuting option if you travel around to meetings and don't want to get sweaty etc (I've had customers buy e-bikes over scooters/motorbikes)
Those margins sound about right.
I do agree with your point. It is very hard to make it work, especially with London levels of overhead.
Servicing and P&A is dependent on your customer profile. It's the same amount of time to replace a Super Record or Dura-Ace mech as a Claris one, but obviously the profit is way bigger.
E-bikes are an interesting area, but not one I feel very qualified to talk about. Anecdotally, I am seeing a lot more about, and I suspect it's not a saturated market. How long that lasts for, who knows?