I used to charge £20 per wheel, thats removing from bike and replacing all done. including balance, new valve and disposal of old tyres.
that along with places like M&P undercutting the price of the tyres to below the actual cost we can buy them for means its not worth us doing tyres.
while out the wheel bearings and pads were checked, Ive known places have to remove calipers to get wheel out and not torque back up again. the old Triumph 955 series were a pain as if left the eccentric bush corroded into the swing arm, could take a couple of hours to get out. time you cant charge for.
on the other hand, this week a pair of budget tyres for my spare car cost £86 all in.