Reading up all Darkstar's post/responses which do proves out that OP is credible on what he's trying to say here.Waiting up for Betcoin.ag forum support account to respond regarding with this issue.
Majority of the users who rolls with huge amount does not have an account here, all they do is trade and then gamble with the profit they made and just repeat their process, so it is not a surprise that you do not see their issues here.
True,not all gamblers do know this forums existence so its no surprising if we cant find any complaints on here but somehow we might able to find related to this locked 100btc thing.