There are lots of posts that seem to suggest that Google
is some form of higher authority whose rules must be
obeyed without fail.
People see "grey hat" or "black hat" as something that is
somehow illegal or immoral.
Your business is your business, if you were a senior officer
in a huge corporation, your job would be to maximise the
return on the capital employed. Your job is no different!
Instead of worrying about what Google may think or how
they may respond, think about generating profit.
From the purest white to the darkest black is just a
continuum. You decide how far up that continuum you wish
to go. It's your business, your choice and your decision.
In fact I very much doubt that any of us work at the extreme
white end of the continuum, we all push the boundaries.
I wonder what shade of hat your competitors are wearing?