I think the cans need to go. It gets the point across with out them and this really is a cool idea.

I do think future budgeting shouldn't include marketing though. This is a slippery slope. Maybe when the Market cap is X size we no longer use funds for this type of activity. On the flip side, if we try to make marketing donations based, it will probably fail. I know from first hand experience with bitcoin and a failed billboard project.

Just some random thoughts :p