Most commercially available powdered sugars also contain a fair amount of starch. I don't mind a bit of starch for ironing my shirt, but for my coffee, I'll take a pass on that.
I would certainly consult with a TM lawyer before proceeding with the "last drop" bit.
Actually, no, I wouldn't need to consult with anybody at all. I just wouldn't go anywhere near that in the first place.
The TM/SM holder could run you ragged.
One way of looking at it is this: If the prospective customer is interested in the offers that you present on your site, then they are a prospective customer and you have nothing to worry about. If the prospective customer is not interested in the offers on your site, then they are not a...