Wrestlers in the various guilds and organizations which organize wrestling matches are paid on an individual basis and receive appearance fees and bonus pay in addition to whatever salaries they may command. Thus they may be paid anywhere from hundreds of thousands to millions of dollars.
Wrestlers may command a wide range of salaries, but it is difficult to assess exactly how much they make in a given year. How many fights they appear in, whether or not they're injured and other factors affect their pay.
Wrestlers are docked for injuries. If they cannot appear, their salary suffers a commensurate reduction.