b. Be more economical in your shooting.
I don't know what you do to shoot 50 rolls a year, in the old days, statistics showed the "average" Joe in the US shot 4 rolls a year. Yes, CS-ers shoot more than the average Joe, but that's because they have DSLR's. If they were all shooting film, I doubt they would shoot half as many shots, and they would not be running from event to event or from model shoot to model shoot, shooting 300-500 each time.
Just for myself, at CS "model shoots" I usually shoot only 2-3 rolls (ie less than 100 shots), and I don't go for every model shoot. However, when I ask around, the DSLR users typically shoot 300 or more. And I'm moving into medium format soon, where one 120 roll has 12 shots only, so I'll be shooting even more economically.
My greatest shoot volume is during vacations, I shot 28 rolls on my last trip to US (21 days) but that's because I shot the same scene in both black and white and colour. I don't take vacations every year.