I don't think it has to be 'all inclusive' price. It only has to be a 'rock-bottom' price that you have to pay while scrapping everything just to get on board with minimum frills. So, as you are at present unable to get your ticket without paying a wheelchair levy, it will have to be included in this basic price. Every travel insurance has been optional, it will not have to be included in the minimum price. Airport taxes - yes, priority boarding - no. And so on.