If I started a business in Singapore (and I have been considering it) I would be hiring employees that I liked and respected, and I'd pay them fairly. I can't imagine that I'd fire them "at will" because I found someone a few bucks cheaper, or that they'd abandon me for a few bucks more. I can't imagine high-value knowledge workers playing these kind of games. Maybe discount supermarkets poach each other's check-out workers but rails programmers?
And even if you were hiring relatively blue collar workers, eg if you were setting up a factory, it seems to me that the fact of being in a hands-off regulatory environment would make employees respond even better to being treated well.
Just because in theory you can get away with acting like an asshole, doesn't mean you have to, or it is wise for you to do so.