I just can't see the reason you need to participate in a gambling forum.
Let me clear up few things, it doesn't matter if you agree to bet on something with more people or something like that, it won't affect the outcome in anyway.
Unlike trading channels, where the users share some knowledge to agree to buy something, and when they make an agreement, they make the price pump as all the members of the channel buys it and makes the demand for the coin surge up.
Betting markets are markets just like trading markets. If there are enough people in a group that that can make a coin pump (admin of channel prob dumping on them) then that same group could bet on one side enough to move the odds of a game.
You are describing blindly following a recomendation of a pump channel, some people blindly follow the recomendation of a bet channel, while other perfer to discuss what information they are using in order to place bets better, that being stats handicapping or whatever else works.