We talk a lot about the Foundry and a special currency; about Zen store monetization; about lack of interests/rewards; and so on. I am having an idea, and I want others to check it and see if it's actually a good idea or not.
First, it involves the idea of Foundry Tokens that has already been suggested. You would get these by playing foundry quests. The new part is that they could be used to buy discrete budget increases on individual maps we are authoring. Maybe one map needs more details, or another needs more encounters. You use the tokens to get a set increase to each (I am thinking separate purchase for each budget). If you want to get more tokens quickly, you could drop some money in the Zen store to buy a pack of them, but everyone can eventually get as many tokens as they want just by playing through enough foundry quests.