Even one booster is a big help completing the five levels to gain the throne. Every day I get two hours of a booster when I first start the game. Sometimes I purchase an hour worth of all five boosters. During these timeframes it seems that I hold on to the throne for long stretches, negating those bonuses. Even 15 minutes on the throne may only result in 2 gold bars. My idea is to multiply any gold bars earned by the number of boosters (1X to 5X) held in that timeframe. That would help somewhat counteract the feeling of “waste” of booster time while sitting on the sticky seat.