Apple is not the most dominant retailer, so not the story being told. It may be the most dominant consumer goods manufacturer, and it does sell retail, but I'd bet Target, Walmart, and Costco (maybe Home Depot) are far more dominant if you look at retail sales. And obviously, they discount quite a bit.
In my view, eBikes are sold like cars. There are model years, and in the off-season there is discounting to get old stock sold. Hence the Black Friday sales here in the US. And this is for low-end bikes like RadPower as well as for high-end bikes like Riese & Muller.
I think it's wrong to say that discounting encourages impulse buying. Maybe for some, but clearly on this forum we have people looking to figure out which bike to buy and then maybe the sale triggers an actual purchase of one bike of another, or accelerates the timing. But, I don't see people not looking for a bike suddenly deciding to spend $1500 or $15000 just because it went on sale.