The ITF itself has little direct control of money and prizes in tennis. The primary source of money in tennis largely arises from the success of the grand slams. Those four tournaments are regulated by the ITF which neither owns nor controls the individual tournaments. The money generated in the grand slams is held by the tournament committees themselves not the ITF and in the unique case of Wimbledon, by a private members club whose true accounts are a closely-guarded secret (the LTA having gifted away our golden, 50% share just a few years ago under Draper). The ITF will derive its income indirectly from the Grand Slams, charge fees and so on but it is a peanuts organisation by comparison which neither controls the bank accounts nor the money. The ITF, for example, struggled to persuade the ATP, WTA and GS committees to stump up the cash to fund a credible anti-doping programme, despite tennis being widely ridiculed (post-Armstrong) for running a poorly-funded, fig-leaf exercise. The solution for better prizes at Futures levels in tennis, as always, lies where the money is which most definitely is not the ITF. Challenger prizes are decided by the ATP but here they are very much dependent on flagship sponsors and third party tournament promoters putting in the money and the ATP faces a continuing problem getting Challenger tournaments upgraded from the basic $40,000, no hospitality tournament.
Not quite sure where this fits, but via a Twitter link, an article on Tiago Fernandes, who was a top junior player (won the AO Juniors) and has retired at 21 in order to study civil engineering. Interesting to see his perspective: tenisnews.band.uol.com.br/modules.php