Plus exclusivity to a trademark mightn't even completely apply within a category you select, if the company/person who violates the trademark can argue that they're catering to a different demographic.
For instance, when Mr Whippy (franchise selling ice-creams out of vans) launched action against a 4 star restaurant selling ice-creams with the same trademarked name, the restaurant argued the technicality that somebody eating at a 4 star restaurant was unlikely to buy a ice-cream out of a van, so there was no violation of trademark.
Such fun.