They wouldn't know that until they already invadedThey wouldn't find much wealth there
He proved for the first time that Britain was an island, .
According to Tacitus's Agricola, Agricola thought that he could subdue all of Ireland with only one legion (and, I assume, lots of British auxiliaries).
They did do a JC raid because some auxiliaries got sent over at one point. Nobody though followed up though.Perhaps it's best not to start off with an invasion but a JC-type raid. Perhaps some of the British ruling elite families who appeared to have fled to Ireland after the Roman Conquest start to do a few raids, aiding any resistance, etc and so the Romans launch a raid to teach them a lesson. Then perhaps they decide it is worth a full invasion
What's a 'JC raid'?They did do a JC raid because some auxiliaries got sent over at one point. Nobody though followed up though.