Is it overcharging, or fixed price charging. Running wires is typically a much larger project than it was in your case; and there is an adverse selection where

Is it overcharging, or fixed price charging. Running wires is typically a much larger project than it was in your case; and there is an adverse selection where people are more likely to hire for the more difficult jobs. Because of this, their price point for wireing probably assumes they will be going through walls, the floor, snaking it through the wooden frame in the floor/ceiling. The other tasks you mentioned all seem like they would be fairly consistent in terms of time and effort, so a fixed price is reasonable.