Content drives replies. I haven't looked at any of your posts, but I will say that people who get a lot of responses typically have lots of information in their posts.
The subject also matters. You're going to get a lot more responses if you're asking how to breed guppies than you will of you're asking who has experience with some rare exotic fish, plant, or coral.
"What, exactly, is the internet? Basically it is a global network exchanging digitized data in such a way that any computer, anywhere, that is equipped with a device called a 'modem', can make a noise like a duck choking on a kazoo." - Dave Barry