I occassionally say to my vet "let's do old time medicine" and I don't feel bad doing that. Many times I ask "will that change the treatment if we know for sure" and I'm told no, but we will know. I already know and the test is just confirming it, not diagnosing it.
For some years I was fortunate to have good greyhound vets at Banfield, so I used both Banfield and my current vet, depending on the treatment.
I'm old and I can't take anything with me when I go, so I'd rather spend the money on the dogs than buy "things" or buy gifts for grandchildren and children who neither need them, nor appreciate them.