A lot of it has to do with not being good enough to be offered gigs or other (paid) playing opportunities, but some of it has to do with a personal disconnect to the idea of Irish music as performance. Of course, if I saw what I do as a possible form of entertainment for others, and I was good enough and confident enough to present it as such, and someone was willing to pay me money to basically do what I would already be doing anyway (which is playing tunes), then I would definitely be open to that!
90% of my music listening these days is to Irish traditional tunes. I view this type of listening as a disciplined study; mental preparation for the music that I love to play, which is basically any form of traditional Irish instrumental tune. That's probably not a well-rounded absorption of Irish music as it noticeably omits the pub style ballad that so many listeners think of when they think of the Celtic genre. It's a selfish indulgence that becomes more complex this time of year.