I think they moved because of rent increases.
Plenty of them still around in Chiang Mai and around the outskirts.
Students couldn't afford the prices there anymore.
Went to 'Auf der Au Garden' last week, all you can eat German buffet for 220bht.
It was very busy an an amazing choice of food, price includes breads, cakes, tea and coffee.
Also went to 'RajDarBar Indian restaurant' 220bht for a Masala curry and plain Naan.
Too many places to choose from!