Since I have several threads there I am well placed to comment. A tiny minority of the posts and threads in the gambling and gambling discussion boards are actually about betting odds. The mere mention of spreads, handicaps and odds is a rarity in itself.
You are right most of the posters probably have never placed a bet on anything except a winner and probably do not know how betting has evolved. Maybe having a dedicated non-betting sports board would be the way forward.
I went through a few of those megatrends, I wonder if even 5% of the post would qualify as being about gambling.
Since I'm pretty sure a lot of the posters don't actually gamble or don't have a clue how to place a bet other than on the winner, most of the discussions there could be classified as football fans talking about their team, one spot in one hundred talks about spreads, about handicaps about anything, it's about X beat Y so they might beat Z, A is a great player or bad one, xerox copies.
That being said, I've been always curious, in that whole mess of a board, is there a horse racing topic as I haven't seen one and it's the only spot I actually gamble on, not just watch.