It always struck me as curious that the Romans settled in Britain and lived pretty well there but never popped over to Ireland to even set up a city or two, even an outpost; I know they blocked off the Scottish which goes towards the idea they just had enough of "barbarism" and called it a day.

But my understanding was that Ireland was much less concentrated with much of the land without very many peoples, so what was stopping the Romans, if anything, from venturing across the channel?

I do remember seeing articles here and there of coins, maybe some bits of pottery being found along costal towns (most likely Dublin) but nothing as grand as a temple or Villa which were being built all over Britain at the time.