"Personally, I think it is the players responsibility"
Thats just common sense if you buy in trading halt and you win you wont get the cash !
"I go out of my way to NOT exploit the time differences,"
Very noble of you but if its legal and within the rules and everyone else can do it you are disadvantaging yourself - not that it matters as you have found an alternate winning formula only a select few have won it 4 times
