+1 What is your time worth? $90 is not much, given shop overhead, taxes, insurance, etc. A lot of bike shops around here have gone out of business, so apparently, its not a great way to get rich.

Do it yourself? Sure. But do you have the knowledge/time/tools/aptitude/space/access to parts, etc.?

And what bike? And does your bike have any issues? And what is in their scope of a tuneup?

The tune up detailed above is well worth $90 IMHO. Now, I have not paid someone to service a bike for me since 1974. But I enjoy working on bikes, have all of the tools, etc.

+1 Add replacing a few components? No way, price is going up.