Perks.com - Is it worth doing?
I haven't heard of or used them, but my concern would be how often would 3,000 employees need the services of a photographer AND choose to go with one advertised with this company over one their family or friends have used? Is that going to be often enough to recoup your $600 every year, let alone make a profit?
I personally think as a photographer, $600 could go to a far better place. Maybe for advertising in a local wedding show?