[nikz]

Are you sure it's not more along the lines of "don't 'play' at it, do it properly?"

Perhaps I'm reading too much into it. I guess that's the problem with this sort of vague generalised advice :)

[im3w1l]

If you read the second version, it is modified into "never play at any game of chance", so I think they meant gambling.

[robbyking]

That's how I read it, too.