-- I disagree on that, and I have a large garage and many tools. -- Haven't had a need for a timing light (had one years ago), and vacuum gage, until now. -- Will have one in the future.
I understand this all sounds like I'm a dick. But the reality is, if you had the tools and the knowhow, and the concern that having to pay someone to do it for you would be costly, you would do it yourself. So from my perspective, you also paid for not having to do it. Would I charge that much? No. But I am not him. And ultimately it's up to him. You gave him that responsibility when you decided it was easier to have someone else take care of it.
A different perspective:
A good steak at the butcher is $8.00. Potato, $1. A steamer bag of veggies $1.29. You put it in your grille, use your spices (your know how and experience used), use your microwave, and use your butter, on your plates, and eat your dinner. Or, you go to the local mom-n-pop, pay the $21.95 plus drink, tax, and gratuity, and walk out happy after paying $35 for a "$10.29" steak dinner. In both cases you've eaten a steak dinner. One you did yourself, the other you gave that responsibility to the cook and compensated them for their efforts and location.