From my experience if you do keep winning most of the time the worst punishment the bookies would give to you is a very small limit to discourage you from playing in their site. Bookies do it because they know only a few gamblers could profit in the long term and as tykiwanuka mentioned it holds them back from making more money.
This makes sense to me. It lets me think about the idea that if one account makes 2-3 big withdrawals is in risk of his account being suspended/checked. Do you really think that i have to change the platform after i make some big withdrawals avoiding all breacking-head, or maybe just using the same platform after changing all stuff (device,account,ip,addresses) ?
No, making a big withdrawal won't risk your account from getting suspended unless you're new to that site and those withdrawals would quickly put you at a big profit. Also it depends on how big are these withdrawals.