It is expensive, no doubt.(*) Regarding the alternatives, no, I do absolutely not realize that, because it is not true. I couldn't and still can't find a retrofit mid drive with acceptable pedal stance ('Q factor'). All of them are inches, not mm's, inches too wide, compared to the 135 mm or thereabouts Q factor of my Roadlite 6. Maybe borderline acceptable for mountain biking. My alternatives were a front or rear hub motor, but there didn't seem to be good torque sensor options for my PF-86 bottom bracket, and ignoring that (I still don't know whether I absolutely need a torque sensor) I also didn't want to replace a wheel. So the apples to apples alternative would then be to buy the factory e-bike version of my bike. Well, I didn't want a second (third, rather) bike either. So that's that. Your situation might be completely different.
(*): I got a really good deal by ordering via Xnito, and saved almost 300 bucks. Still expensive though, essentially doubling the cost of my bike. Other people of course are a lot more spendy with their biking hobby/affliction...