jake, agree a man can't make a living just by trapping or hunting. But a poor man can go hunting or trapping. The poor man just can not depend on fur as his single income.
The professional trappers I know have side jobs. Others are in it full time by selling/making lure, supplies, writing books and nowadays, making how-to videos. Others are fishing guides or big game guides or do ADC work, on the side.
Some pro trappers I know do very little trapping because of their successful lure/supply business. Just before the season and during the seasons in different parts of the county, lure makers don't have time to run a line, they have to tend to business and ship orders on daily basis.
Professional predator callers have other side jobs too. Some are have sponsors. Some sell how-to videos.
Just can't make ends meet nowadays depending on a fur check. Fur pro's depend on other revenue.
Having said that, These same pro's run their lines like a business, maximizing the profit where they can.