In. We do this at work too…like 12 of us. $10/month from each person. She gets all of the ticket numbers on one ticket and then posts it on the wall and we await the results. We’ve only won like $10 at most so far :lol
Most simple way would definitely be to post in here an image of your ticket which then becomes ‘the groups’ ticket. Per the agreement you speak of (that it’s binding if we say ‘in’), that would be the same as meeting physically to give tickets to one person.