The important thing is what these users are contributing, are the rewards they are earning, whether they sell everything or not, comparable to their contributions.
I think this is important. I know there are some users here that treat power downs or hive withdrawals as all important when upvoting somebody. However, there are other ways to contribute, quality content being perhaps the most important. It doesn't seem like we should be potentially pushing away good content producers just because they need or want to actually spend what they earn. I mean you aren't really earning anything if you can never exchange the earnings for goods and services.