I'm undecided on whether I see that as a "mind virus" or just the right choice to maximize happiness in the long run. My impression is that spending my time doing unproductive things that I strongly enjoy (like videogames) is somewhat of a local maxima in terms of the happiness it can bring me. One day my favorite game servers will be shutting down, or scraping along with a small fraction of players as everyone's moved on to the next game, and I will have virtually nothing to show for all the time spent. In the best case I'll have a handful of memories that I enjoyed, in the worst case I'll have a deep regret that I spent my most capable years on something that is of no use to me anymore. Presumably by being productive I can avoid that regret, and I'll have skills, money, or creations will be useful to me for much longer. That's my theory of how sacrificing some happiness in the short term should make me much happier in the long term.