Very quick John!
The answer to your question Murray, I would think, lies in the relative anonymity of Micky as a performing artist. He is known for more 'famous' songs like 'Only our rivers', but more for the writing than for the performing; though I must say that Micky is a very entertaining performer, and his own renditions of his own material is second to none.

Niamh Parsons is, on the pther hand, a 'name', and although Micky did record a CD in Colm Sand's studio (as far as I know), where he laid down most of the stuff including Peter Pan & me, the album would hardly have been as widely distributed as Niamh's would have been

However, if you should ever be in the town of Listowel, Co. Kerry on a Saturday night, pop into the Arms Hotel.
He could well be in the corner with a crowd of people around him enjoying the songs and the craic.

Stay and have a pint.