<p>This is out of our control: it would have to be implemented SE-wide by the developers.  In addition, it is intrinsic to the SE system.  The <a href="https://stats.stackexchange.com/help/badges/50/tenacious">tenacious</a> and <a href="https://stats.stackexchange.com/help/badges/51/unsung-hero">unsung hero</a> badges exist in part to incentivize / reward users who answer lower visibility questions.  </p>

<p>As far as creating a scheme to categorize threads and identify threads that are on less popular / more esoteric topics, the tag system is intended to do that  (although I certainly believe it requires constant maintenance to serve that role well).   </p>

<p>If there is a particular thread that you believe will be of value, but will be more difficult to answer, and may not be sufficiently rewarded, you can place a bounty.  (An alternative, given that you may not have enough reputation right now to place a lot of bounties, is to mention it in chat.)  </p>
