I use it when on cheap city breaks - Im too rural for it to be much use - there's only Gregs and Tim Hortons signed up anywhere near me
But when Im in a city - breakfast and lunch is usually taken care off for a pittance. One time we got really lucky with the Cornish Pasty company, we didn't have time for lunch before our flight home, we got two huge pasties which we ate for lunch, two pastries which we had at the airport and I still had two steak slices which DH took to work for lunch the next day - £4
If we are in an Airbnb near a hotel , the breakfasts are great value, one bag is plenty for two , I collect take it to the Airbnb , heat it up if needed and plate up
Morrisons are also very generous with their bags