seconded I am suprised they did not already own that domain name. As far as I am aware, trademarks are only valid if registered, Coca cola own their trademark, but it does not mean they are the only caffiene based fizzy drink in the market. It just stops people imitating thier logos and slogans (as far as I understand it)!!
On a seperate note, the fact that you are asking this question tells me it does not sit 100% comfortably with you, indeed how would you feel if 6 months down the line someone else started trading with a .net version of your domain name.???
It would be a PITA if you registered this domain name and then spent money getting cards & merchandise made up with it only to have to change it 6 months down the line.
A further note to add here is Google rankings rate domain names that contain the word "photography" higher than those that dont, so snappysnaps.whatever would always rank lower than for example cheapweddingphotography.co.uk.