Because they understand the requirement, but unfortunately some of them don't understand how to gamble.
Maybe they will learn along the way, and that would be a good news so we will only read here real and valuable information of the posters.
Being a gambling board poster, I can only see few people who shared the same interest of mine, majority of the people are just discussing a general topic but not on a specific games or events since they don't really gamble.
I'm one of the guy I have sign up to a site that offer a bonus or credits so you can, after getting the hang of it I soon find out that there are a lot of gambling campaign that you can participate, if you are active in the gambling discussion, and lucky to get on the Bitvest list, it's fun and rewarding I hope Bitvest campaign will stay for more years.