A small fee can be very weak in limiting boosting. Let's say the fee was 1k per person changed. Someone who buys a lot of gralats or has lots of gralats or loots a lot for instance this is hardly something to overcome. But not being able to get points without having all the main core on and if changed needed a 6hr time wait until getting points can be a huge cool down in how quick players can get points. For instance if what happened at last GST happened again players would be forced to play with only the main tag. The cool down is too long to wait to gain points.