I assume you mean neither food nor food allowance. It is ok for helpers to buy their own food as long as they are paid a food allowance of min. $740/month.
I love having a helper, but I hate how many people treat their helpers.
You are so right about public service announcements. Apparently people aren't competent enough not to fall over on the MTR escalators but managing a helper is perfectly clear to everyone.
By the way, there has just been a book published on the subject:
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