We can only imagine what Hillary Rodham Clinton is being paid to speak at Thursday’s Massachusetts Conference for Women. Literally, we can only imagine. That’s because organizers of the sold-out event at the Boston Convention and Exhibition Center aren’t saying what the former secretary of state — and possible 2016 Democratic presidential candidate — is being paid. “The conference does not comment about speaker arrangements,” a rep told us in an e-mail. But our guess is it’s a lot. Consider this: According to The Washington Post, Clinton received $300,000 to give a 20- to 30-minute talk last week at a public institution, the University of California at Los Angeles. Thursday’s event, meanwhile, is presented by State Street Corp., with contributions from a host of other deep-pocketed companies, including EMC Corp., Cisco, Boston Scientific, Raytheon, Santander, Bank of America, CVS Caremark, Hill Holliday, Houghton Mifflin Harcourt, John Hancock, and Liberty Mutual, among others. It will also feature actress Lupita Nyong’o, designer Tory Burch, Life is good cofounder John Jacobs, Bank of America’s Anne Finucane, and former Young & Rubicam Brands CEO Ann Fudge. An estimated 10,000 tickets — at $195 each — were sold to the conference.