Because of this bug, I would say yes. Is it HOW the game was originally, NO, it isn't normal. We used to get about 46,000 plates per day, then it got lowered to about 42,000 plates per day, now if you keep your game open you'll be lucky to sell 1,000 plates per day.
I go into my game, do what I have to do quickly, then force close it out. I NEVER leave my game open and have hardly redecorated lately because if I do, then I lose customers and don't make money.
With your 8,000 in the last 10 hours, your total for 24 hours is looking to be 19,200 plates for the day. Big difference from the 46,000 we were getting a few months ago.