I don't see why you're so surprised, OP. In the beginning there was only bitcoin. But now we have over 300 different cryptocurrencies. Bitcoin is great, but it's obvious that the amount of posts created about bitcoin simply can't outnumber the plethora of posts for each and every one of the new and old alts out there.
It's just numbers.
That said, if people want more BTC threads and posts, just post more. And yeah, if the altcoin posts are annoying you -- it's time to ignore those boards.
I agree to this. This is a strong indication of the fact that how the interests of people are changing with time and alt coins are getting more popular. I am also concerned about those fraud projects popping up every day as some new investors might get affected by them.
But there are coins that are giving better returns in comparison to bitcoins. Most of the people are concerned about returns only and they are not loyal to any coin, even if it is the bitcoin with which all this crypto started.