I have heard a guy fired 300 shots in a single outing. Try doing that in a film SLR and you'll be broke in no time.
With dSLR, just need to recharge your battery and erase the dud shots. I think it's an utter waste of time and effort.
When I shoot, I take time to think and adjust and compose. So far the most I have done in almost 30 years of shooting is 2 rolls in a session and that was a big waste of film IMO.
At the rate of 200 shots a session would mean 10,000 shots a year. In 3 years, the camera would more or less have reached the design life of the shutter and mirror - the camera would be more or less finished. Thus wearing out an expensive gear in a short 3 years, or probably, the shutter and mirror could be changed if it's ever worth it. So, those who buy used dSLR, watch out for those overused ones that are over a year old. Wear and tear too for the AF motor, the aperture blades of the lens.... also watch out for those used lenses bought from dSLR owner too.