Contrary to popular belief, generally reporters or journalists do not pay for interviews. People hear about rare exceptions to this, and think it's the norm, but it's not. The most you're likely to get out of a reporter is them paying for your lunch.
As far as the cycling world goes, the only possible exception to this I know of is David Walsh compensating Emma O'Reilly, but to what degree is disputed. Lance defenders say she had an axe to grind and was interested in getting a piece of a reported $60 mil whilstleblower lawsuit Prentice Steffen intended to file and Walsh paid her to talk. Walsh initially said he didn't pay her for the interview, but later said he basically was covering her food, transportation and hotel to help her out as Emma feared for her safety after her diaries were discovered with all the salacious dealings of USPS.
I don't know how much money some of these cyclists have made from the books they have written, but probably not much. Maybe Lance' Its Not About... sold well. But you would have thought Floyd's Positively False would have sold well, and by every indication, he's now broke and sleeping on couches. I have a friend who was a best seller romance novelist. If you read these things, you'd certainly know her name, and while she's living fairly well, she's anything but rolling in the dough. I would have thought she'd be much better off than she is.