"Of course, guys like Novak, Roger and Rafa, they're doing just fine," world number 21 John Isner said about the proposal. "But, we all realise that the tour is more than just a hand full of players and that we have to help everyone out."
However, world number three Thiem, who lost to Djokovic in this year's Australian Open and has earned more than $US23m ($NZ38m in prize money, isn't interested in helping out.
Under the proposal, Thiem would give up US$30,000.
"None of the lower-ranked players have to fight for their lives," Thiem told Austria's Krone Sport.
"I've seen players on the ITF-Tour who don't commit to the sport 100 per cent. Many of them are quite unprofessional. I don't see, why I should give them money."
26-year-old Thiem is a 16-time winner on the ATP Tour and has made three grand slam finals.