because it is a scam site
and you are lying about the withdrawal.
and it is pretty simple to detect your lie even without doing any research about that site: "if it was cheap and possible to withdraw you would have bought bitcoin elsewhere, dumped there, withdrawn, rinse and repeat, and certainly would have never shared it here."
There are limitation daily on withdrawal to PM ,like 500 usd Min.
That limitation keeps a lot of people out and their KYC(know your customer) is very strict. especially for first and big amount.
Yes you are right . I am dump bitcoin there and making some daily income.
But my question is ,why it has that high price. almost 200 usd higher than bitfinix.