How about you give us 3-5 key Phobie on a weekly basis for free? It could spice up gameplay and help new players to catch up.
Or maybe link it with certain stress level? It could be rewarding like higher stress level = more phobies or vica versa - level 1 3x, level 10 2x level 20+ 1x free Phobies
I can also imagine this could be the way to test out new Phobies too.