Thanks to the way the commission payments are structured, the more bookings that users make through your links, the higher the commission you'll receive. The rates start at 25 percent and go up to 40 percent once you've surpassed 501 bookings. To clarify, that means 25 percent to 40 percent of Booking.com's commission, so don't expect to get that percentage of the overall cost of the hotel stay.
The problem with affiliate marketing, like many other home business options, are the so-called gurus and get-rich-quick programs that suggest affiliate marketing can be done fast and with little effort. Odds are you've read claims of affiliate marketing programs that say you can make hundreds of thousands of dollars a month doing almost nothing ("Three clicks to rich!"). Or, they suggest you can set up your affiliate site, and then forget it, except to check your bank deposits.