I purchased the XP and Coin boost from the store yesterday, they both appeared above the heath bar. I didn't do much after this and logged off shortly. Having logged in again today I noticed the icons missing from my health bar and doing activities didn't seem to be yielding extra results. For example I tried a drinking game and bet the maximum 200 and won 400. Surely this should be 600? If this is not the case than I wouldn't have bought it if its purely for the coins you find around as they are such small amounts. The XP does not seem increased either.