Failing to use tx fees is mooching. Using a (
notoriously inept) "service" that fails to use tx fees is also mooching. Placing a bet when the resolution is imminent is dangerous. Doing so without a tx fee is suicidal. The rules governing this possibility are in
BitBet's FAQ.
It is unfortunate that you deemed it alright to wager your BTC with a service whose guidelines you had not read, and before you had grasped the concepts of transactions and confirmations in the first place. That you made these choices, however, is not anybody else's concern.
You are a cold-hearted *erk. Guy lost 10k dollars! I'm on his side and he is fully right! Anyways, the problem is that Bitcoin-qt sometimes asks and sometimes doesn't ask for tx fee? So how can it be forced? I don't see that option.