That could be the case, but don't be so sure that people will just leave if their favorite topics aren't being rewarded..

Personally, most of my posts are photography - because that is a very important hobby for me. My pictures usually make a few dollars.

Recently, I did a few posts regarding the minnowsupportproject, and they made significantly more rewards.

Will I stop posting photography? Nope, but I might write about a wider variety of topics, to include some of the more popular ones.