Even average players earn shit loads, Tim Henman won over $11m in his career and Bogdanovic (the GB #2 ranked #189 in the world) has earned over $500k to date (in 7 years as a pro) and $30k this year. Plus you've got to add on all their sponsorship deals, plus the GB players get pretty good financial support from the LTA.
Fuck this, anyone for Tennis?
I'm pretty certain I'm better than Alex bloody Bogdanovich.