That is called zero-click. SEDO tries to find alternate ways of monetizing your traffic in the hopes of increasing the revenue
BUT
if you're looking to sell the domains, zero-click can be totally destructive since there's usually no 'buy now' links and also in some cases you can get a google ban due to all those spammy sites that your domain links to.
You can always opt-out. Just contact SEDO and tell them you don't want zero-click redirection for your domains.