The other thing I have some concerns about is the amount of 0.373 BTC. Does that include the 0.1 BTC (IIRC) that Sportsbet offered to pay out?
0.373 was the balance when sportsbet closed OPs account. Sportsbet offered him 102 mBTC. You may want to read sportsbet response here if you did not-
https://bitcointalk.org/index.php?topic=5263445.msg54840690#msg54840690I did, thus the question since I couldn't see those amounts put together in a coherent manner to make it clear what we're talking about.
So the flag is basically invalid because the dispute is about 0.271 BTC, not 0.373 BTC as claimed in the OP. I could understand a small discrepancy but I don't think we should be supporting "written contract" flags overstated by 37%. There's probably more reason to oppose the flag than support it based on the amount alone, i.e. the claim is "at least partially false".