I do use campsites and wild camp where there is little option. I enjoy eating in pubs when on a big multi week walk - it is a welcome change from dehydrated food which, no matter how good, is no substitute for fresh food. I try and BnB once a week on a big trip but this is harder with a dog these days. I also think I have a duty to contribute to the local economy of the places I enjoy, if I did not they might not be as they are.
I know a lot of people get enjoyment out of driving to a place after having bought their fuel in the cheap local supermarket, taking all their supplies, wild camping and then driving home having had a good time and spent very little (although taking in the cost of running a car and it is not so cheap) and contributing nothing to the local economy (except their car's pollution) - as if they are bucking the system.
I get a sense of purpose from getting to my start point on public transport, mixing with locals in shops and pubs en route where they exist and experiencing not only the countryside but also the local culture and returning on local transport.
Even when I go on holiday in a cottage with the missus we always try to find good local suppliers of food.
I remember talking to a bloke from Llanberis (a miserable git but he had a point) who called all those who come to walk up Snowdon parasites, he said they come in their hundreds of thousands each year in their busses and cars, go up the mountain and most go home contributing nothing to the local economy. I am not saying I agree but he has a point.
Pubs, public transport, hotels, shops, use it or lose it.