That is CHEAP - so long as they arent marking up vaccines, supplies, etc up as high as everyone else.
My cow vet charges $185 an hour no matter what he's doing whether it be herd check, surgery, consulting, a calving, etc, and all the 'stuff' he has to use is then charged at cost. Stuff he leaves in the fridge for us is marked up modestly but not much more than 50%. He is making bank doing it. I have a wonderful relationship with him, and if I call to ask a question or send him a text with one I will ALWAYS get an answer.
The theory behind it isnt usually to stop chatty vets, its to stop clients from wasting time. If he spends 45 minutes in the back 40 trying to catch animals, the owner isn't ready, etc, yes, it should cost you more. If the owner wants him to stay an extra half hour to chat about something, putting everyone else's appointments back a half hour too and making his day longer - yes, it should cost you more. Dare I say its even a little rude to expect him to stay longer then planned to talk to you when he has a whole laundry list of clients waiting later in the day.
Most vets, even those that charge by the hour won't charge you if you call the office to ask a question on a day when they aren't running around like a madman trying to get all appointments in. I wouldn't use a vet that would charge if I called when they were in office or having downtime to ask a question. I understand completely though that on a day as normal as any vet has though, he should be compensated for me holding him up by being chatty or asking questions that can wait until later.
If I want him to be the one educating me, he should be compensated for it. He paid north of $300,000 for his education - why do I expect him to give it to me for free? Most clinics will hold vet days, seminars, etc. that are rarely anything but free - and I've never seen one with an admission cost over $10. That is the time when 'routine it doesn't have to be done right now' education should happen. Going over how to do aftercare? Never had it take more then 10 minutes tops.
With my line of work I've had the awesome opportunity to go to a lot of seminars that vet's go to to improve their skills. At a week long advanced cattle hoof trimming course, I was the minority because I didn't have a PhD. Sitting at the bar with practicing vets at night was the BEST education about how they worked and how to keep your vet happy. One guy (a little tipsy at the time) was talking about how one client called him at 2 am expecting immediate service because her horse hadn't pooped in like 4 days, then complained about the (understandably so) hefty bill. In his exact words "If you call me at 2 am for something you should've called me at 3 pm 2 days ago for - yes - it should cost you like $2000 freaking dollars."
I love vets that charge hourly, by the minute, etc. As stated before, my cow vet charges $185 an hour - when I had a horse vet out for my Welsh X's colic - it was $231 for a hour and a half of her time by the time she nickeled and dimed me. It comes out darn close to the same either way if you are efficient for your vet.