I have found it does not. From what I can tell decor helps with customer patients but does not earn you any more coins. Someone please correct me if I'm wrong.
Well, if it increases their patience, they'll be more likely to leave more coins, right? I've found that it helps a bit. I'll do it as a last resort if I can't get that fifth star no matter what.
With the recent version, it's possible for tips to increase too, up to 28% The 4 types of decor now gives us either patience boost (up to 225%, which is equal to the highest sum obtained in previous versions), max tip given (28%), level time (+15s), speed increased (15%) and customers added (up to 3, which makes me question the use of Happy Hour which at present doesn't give extra time and customer anymore, now it only gives us extra prep dish characters)
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