This article from the Association of Cycle Traders shows how important eBikes are becoming to the trade.  Even the big companies are relying on them to increase revenue.

When entry level bikes are around £1,000, mid end around £4,000 for off road and £2,000 for on road and top end £6,00 plus, and they are in a sector showing much higher growth than other forms of cycling you can see why this sector is attracting a lot of interest.