I think that when they first came out, my firm started out by charging circa IR£100 plus V.A.T. for doing an enduring power of attorney - it really didn't pay at this level - there was a lot more work than expected.
These are still relatively uncommon (i.e. no real economies of scale), the paperwork is a bit of a drag and the solicitor is assuming a fairly high level of responsibility for getting it exactly right; so many solicitors are not particularly keen to do this work. For this reason, it's a bit like a builder pricing a job that he doesn't really want - it would not be unusual to be quoted a fairly stiff fee. I think the job probably merits a fee of €450 plus V.A.T., but it wouldn't be unusual to see a solicitor quote double this.
Of course, if it is the solicitors first enduring power of attorney he/she might quote €120/130 plus V.A.T. - a mistake they won't make twice.