Why is it that frustrating that you can't withdraw more than 5BTC at a time?
If you are already okay with all their withdrawals taking up to 24h, you should be thankful as long as they do actually pay out.
According to OP's posts, he received 5 btc after 31 hours, and the remaining 3.7 btc after another 56 hours. I guess it is normal for one to get frustrated and worried when he need to wait for more than 3 days for the money he earned rightfully.
Plus, there are better sites out there. Why should he stick to that site?