What is going on with 70-80% of the most recently (like 3-4 months) asked questions? I remember when I joined the first time, most questions really excited me and looked interesting from an intellectual standpoint. Nowadays, its all about "where can I get freebie data", gimme this, gimme that...has another website sprung up which where other quant geeks gather or has the world run out of quants, or have all questions been answered? ;-)
Nothing's changed; there have always been non-quants looking for free data online. There's been a recent surge in this, yes, but it's a lot better than what it was two years ago when every question was, "What should I learn to become a quant?"
This site will always be small. We're a highly specialized topic (like Theoretical Computer Science) with the added bonus of extreme secrecy as the industry norm. So it's hard to find knowledgeable people who will openly post about things that aren't even proprietary.
Compounding this problem, of course, is the sheer volume of outsiders looking in. This is what you've noticed. The extreme version of this is Quora, where every question is, "What programming language do quants use?" The moderators have been pretty vigilant to stop this, but there's really no way to change human behavior. People who want to post on a site they have no business posting on are going to do it whether we tell them to or not. My solution has been to readily suspend the repeat offenders.
Why don't you set an example by asking a couple of new model, iconic, awe-inspiring, carved-in-stone-for-future-quants-generations questions? For, it's better to light a single candle than to curse the darkness...
More seriously, there was an excellent (though short-lived) initiative by @Tal Fishman some time ago, i.e. the Weekly Topic Challenge. Might be worth rebooting imo.