As an aforementioned user, I can assure you that altcoinstalks is a spamfest. Having "Coin Voting", "Bounties & Rewards" and "Aidrops & Giveaways" as the very first sub-boards visitors will immediately see, says it all.
If you pay a little or more attention to the forum, you would have seen that there is a massive reshuffling going on right now, with open discussions on boards and sub-boards to be deleted.Things may be slower since the administrator does not sit behind the monitor and make choices; instead, he allows members to decide what is best for the forum. The ALT forum is more democratic, which is something we lack here.
There is no such thing as a spam-free forum; if you're waiting for the forum to be spam-free, you will wait forever.