If you're talking about "meaningoflife", that's mostly something we're using to benchmark our difficulty algorithm. The difficulty is approaching zero pretty quickly, meaning it won't be handing out sickles for very long. Sorting out problem difficulty algorithmically instead of arbitrarily makes it harder to game the system--if someone writes a bot, difficulty will go to 0 pretty quickly without us having to do anything.

Most of the other ("realer") puzzles randomly generate after you solve them the first time. This keeps the difficulty (and sickle handout) up.