10.000
Appearances, winning events, but most importantly, their sponsorships
Swimmers don't get paid much, as they have to be 'amateur' to compete in the Olympics. Most of their money is made from other jobs, and if their good enough advertising and sponsors. (Commercials, magazines, ads, etc.)
Swimming became a professional sport, like all other sports, when television brought enough money into it to attract sufficient sponsors to enable the top swimmers to become full time and make a living from it
Swimmers actually sweat the most.
The fastskin speedo swimsuits have changed the way that swimmers race in 1913 swimmers used to wear woolen swim suits but now because of the change in technology companies such as speedo can make swimsuits that cause less friction.
a lot
10000000000000
Amateurs make no money from playing in any professional event.
You can make alot of money. The highest people can make for singing is $1,200
60000000000000000
$80,000 a year