I could get into a big speil about gloryhunting etc, but whatever. For one thing, I think a there is a line between a 'fan' and a 'supporter', with fans being more casual. There are more understandably more football fans than supporters in the world, and with Ireland being a small place with a small population, the number of people who would be into football enough to be a supporter is compartively smaller. Then when you consider our countries history, having such a close bond with a big country like England which has historically had one of the most prominent, famous leagues in world football, I suppose its unsurprising that so many Irish people get into English football, then it becomes a generational thing, with people bringing their kids up to support the same big trophy-winning English club that they do. You might object to the term gloryhunting, but thats what it is. There are no great fanbases for Wolves or Stoke over here.
Being a part-time league in a small country, of course you're not going to see fantastic flowing football every week at a League of Ireland ground, but its still football, the standard is higher than most give it credit for (many dismissing it with having barely seen any) and I do wish more would give it a chance, even on a casual level. I mean, I haven't really read it much, but there's a thread on here about the Norweigan league that is far longer than the one about the LOI, despite there being a higher Irish presence on this board. Thats just a small collection of my thoughts on the subject.
For all the poor football and worse administration I've seen, I still love watching Shelbourne, I've gotten far more out of it that watching the Premier League on the tv. Now if you excuse me, I have a cup final to go watch.