Another aspect may be that Irish railways never really had a 'glamorous age', as most others did. It's always been a utilitarian transport provider.
The lack of items available isn't always a bad thing, it does limit the expenditure, in fact...
To some extent, the amount of Irish stuff appearing these days is becoming a problem to keep up with.
With a current exposure to about one thousandth of the world's population, it is likely to remain a niche market.
But, compared to the position just twenty short years ago, the leap into the future has been prodigious.