Conventional wisdom in the games industry says a game is either a hit or a flop. wooga's CEO Jens Begemann has a different philosophy: Every single game wooga creates is an enormously valuable asset.
Once a game service has run the gauntlet of production and you've brought it to life, commitment to honest evaluation, iteration, and evolution will ensure you recoup your investment and more. Of course, as with effective recruiting and evaluation processes for hiring employees - game ideas must also go through a thorough vetting process before they become live game services.
When the going gets tough, remember that there was a reason you committed to the idea in the first place, and abandoning a valuable IP a little too soon costs you much more than sticking with it a little too long.