There are various ways to get infinite and infinitesimal utility. But they don't matter in practice. Everything but the most infinite potential producer of utility will only matter as a tie breaker, which will occur with probability zero.
Cardinal numbers also wouldn't work well even as infinite numbers go. You can't have a set with half an element, or with a negative number of elements. And is there a difference between a 50% chance of uncountable utilons and a 100% chance?
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one. (Immediately before; refresh the list-of-threads page before posting.)
3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.