On the other hand.....
What is the going rate for...
A car mechanic?
An electrician?
A bricklayer?
A .... lawyer?
The perception is often that a shop mechanic is just a bloke with a spanner...
In Denmark it's nigh on impossible to get a job as a shop mechanic (unless you have contacts and solid references) without having completed a 3 year apprenticeship. And that costs ....
Hourly rate in a danish bike shop is approx £35. Bear in mind that shop owner has to pay VAT, rent, wear and tear on tools, the mechanic's wage which is typically between £10 - £14 per hour, tax, rates etc... etc...
Fitting a headset should not take more than 5 minutes and most shops in Denmark will fit a £25 headset for free if bought in the shop and you show up with a stripped frame as it takes longer to get the tools out than it does to use them...
but correct removal of stubborn headsets... without risking damage to the frame requires a tool that is actually very expensive and prone to breakage (no you can't use an old fork steerer!). We wore 2 out every year....