I assume that even if you're extremely good at it, it's half a day of work. So I'm not sure about the economics of it once you include labour, rent, machine expenses etc...
Especially not at western levels of wages and commerical space rental costs.
Such services might be economically feasible in places like Taiwan or China where these skills and equipment is abundant at every street corner, but if you have to pay someone in the west where these skills are specialized with high hourly wages, to do all that for your laptop, the cost could be higher than if you would flip your existing machine on the used market and add another couple of hundred bucks on top to buy a new laptop with the exact specs you need.
(Trust me, I'd be learning how to do these repairs if the costs weren't almost doubled by shipping alone in the US.)