Umm… I’m thinking ‘conference room’, not ‘sleeping room’. The draw would be the networked play, without lag, etc.
The question would be whether legal copies of the games were being used, and whether the games’ licenses prohibited this type of use. It might depend on whether he spun it as a rental fee for PC use, aside from the software being used (and how the laws in Ireland saw this usage).
Now that we’ve got that covered, how about the moral question? Would it be immoral for a football team to have a match on a Sunday? If not, then this too wouldn’t be immoral.