I hear every now and then that Bitcoin discussion / Trading discussion / Gambling discussion / altcoin discussion (and many others) are considered as spam sections. Like to hear opinion if all the above sections come in the category of spam sections and if so, where do we discuss topics related to gambling, altcoin and general bitcoin discussion ?

Why do we declare these section as spammers heaven when i do find some good discussion going on there (if not all).  There are many spam posts too but we cannot say that they are 100% useless post in there.