I am sure you can do a search and find a ton about this, but many answers are just throwing crap out there. The answer is they get paid in many different ways:
Based on big name athletes (Tanner, Jon, TJ, Corey, Dumont)
Salary:
Outerwear: $40k - $80k year
Goggles: Around $10k year
Skis: Not sure hard numbers on this one but probably $40k and up I think?
Tanner, TJ, Simon probably with all sponsors are pulling SALARY of between $150k and $250k maybe more, depending on contracts with Target, Grenade, Giro, Red, Paul Mitchel, Red Bull type companies?
Those are the big sponsors as they are most prominent with logos...gloves/boots and other stuff are all I think under $10k a year. This obviously depends on the company and rider we are talking about.
Comps:
Winnings obviously, but also many companys will match the winnings to a percentage.
Photo incentive:
Clearly see the logo in a Mag then get paid on that, huge variances of what $$ they get.