I think Sexyvampire that it's because the norm are incalls in Ireland. In fact I don't even check anymore when reading a profile (as there are so many other details I'm more interested in).
When I first started punting in Ireland I was debating whether to go with incalls or outcalls. I soon discovered that most girls only do incalls even if outcalls are advertised (especially for the first visit).
So I guess it's a common mistake Sexyvampire but I'm sure you could entice your callers into letting you visit them!:)