This idea that Chinese tourists spend so much more money than Westerners is just silly.
Most Chinese spending is easily tracked - hotel stays, spending at big shopping malls with special discount cards and VAT refunds, and all their block-booking activities with tour groups etc.
I can spend large amounts of money in a day - visiting local bars, restaurants and shops, getting tuk tuks or renting transport. I pay for eveything in cash, and not a single baht is trackable by the "Thai Tourism Statiticians". Try asking local businesses if they get more trade from Chinese or Westerners and see what their response is ...