As far as the points earning, it depends on who's ticket the accomodation charge is printed. (The fare is actually the rail fare for each person and the accomodation charge for the room for both.)

To simply things, I'll say the rail fare is $75 and the room charge is $125. Ticket #1 will have a fare of $200 (rail fare + room charge), ticket #2 will have a fare of $75 (only the rail fare). Ticket #1 will earn 400 points on their AGR account, while ticket #2 will earn 150 points on their AGR account.

I have traveled with my sister, and this is why her AGR account shows (for example) 200 points, but mine shows (for example) 550 points for the same trip! (My ticket had the room charge shown.)