My big money lenses just didn't make money, nobody really wants to pay for nature shots taken with 400 2.8 lenses when so many people now give images away. I can honestly say I've made more money from a single gopro 2 in the last two years than any of my slr gear over the same period. Both footage and frames from the gopro have regularly appeared in the media which were purchased through stock libaries,
some footage I took was used to play a big part of the downturn of the super trawler (Magaris). Don't get me wrong I still prefer the quality you can get from slrs, but often, even if you are carrying the full kit by the time you check settings, swap lenses you've missed your chance. I'm sure I used to carry around 20kg of gear with two 1dmk2, 5d mk2, 400 2-8. 70-200 2.8, 24-70, 17-40, 100 macro etc etc etc (most now sold).
Jon
By the way I also fish out of Narooma and own my own boat and 4x4, I mainly target game species and deep-drop etc ($$$$$ ouch).