Vasilicus
Smash Journeyman
Here's what I think and I see this in a lot of online games that have tried this. Basically a lot more people are going to want to play than just watch. Since the matches are random you can't have like a bunch of players choose the same match to watch and bet on. So, mathematically, the chances of even one player watching a match at any given time is miniscule. Who are you gambling against? Unless you can bet on multiple matches at once (Doesn't appear to be an option) looks like another failed addition.
EDIT: Yes this is my first post in 16 months, get over it.
EDIT: Yes this is my first post in 16 months, get over it.