The chairman of the Greater Miami Crime Commission told a Senate subcommittee investigating juvenile delinquency yesterday that south Florida’s tourist-rich Gold Coast had become a mecca for homosexuals. Daniel P. Sullivan told the subcommittee headed by Sen. Robert C. Hendrickson (R-NJ) that there has been a “tremendous increase”* in the number of perverts making the Greater Miami area their head. quarters. He said recent estimates put the number of homosexuals here at about 8,000. Sullivan blamed the increase partly on a rise in the number of bars and nightclubs which cater to perverts. Miami Mayor Abe Aronovitz told the committee that his recent crackdown on perverts had “materially improved” the situation. But he said “the federal government should spend money to help local governments battle the problem.