With allergies and my illness, I no longer look at price. I look at what I can eat. So, sometimes, I'm eating the cheapest thing on the menu...and sometimes I'm eating the most expensive.
That said, I don't choose incredibly expensive "starting point" restaurants, especially now (my spouse used to take me out to high end French as my birthday gift - that stopped when my 1st allergy kicked in b/c taking dairy away from the French pretty much removes the whole menu to where it's not worth going to get possibly the one main dish I could eat, with no dessert or amuse bouches, etc)...