Probably because of the climate spicy foods tend to be popular here. Sadly we lost an excellent Thai restaurant some months ago, and although it looks as if the premises will re-open as a restaurant it seems it'll specialise in Greek food. I hope the new owners will rethink that as I don't see Greek food taking off, not as I know it. Another success story yet to be written is an Indian restaurant (Indian sub-continent - usually Bangladeshi).
Neither of these would go down a bundle with the native locals, but there are a lot of ex-pats here who would kill for a decent Thai or Indian curry!