@The Pentacle Queen,
What I find to be the best burger in Albuquerque, found at a charming sit down restaurant in Corrales, still is, I think, $6.99. I've had other incredible hamburgers in cafes in Los Angeles, for something like $9.00 or $10. All of these come with some kind of side 'dishes'. They had In-and-Out Burgers in LA, not bad for a drive through, though I remember wondering what all the fuss was about. I do remember they are famous for good procedures re the business as a whole. Haven't been there in a long time, don't remember the cost, but I assume it is MacDonald's equivalent.
What I think of as the worst burger in Albuqueque, also at a "sit down restaurant", comes with one side dish and is $5.99. I figure MacDonald's and Carl's Junior - where you can go in and sit down, should you wish, but all plastic all the time - are better than that place, but I haven't been to either of those places in many years.
Given the value of the dollar and the pound, $10.00 for a non-drive through burger seems even low to me - or at the least equivalent - especially if drive through places are as inexpensive as you say, PQ.