Can someone explain this to me?

Family Feud has been around since the mid-70's, and put actor Richard Dawson (ex-Hogan's Heroes) firmly in the forefront, after he'd been a panelist on Goodson-Todman stablemate Match Game for a couple of years. After Dawson's second tour of duty, Feud has gone through a series of hosts, changing every 3-4 years. First, it was comedian Louie Anderson (who has not gotten much television exposure since leaving Feud), followed by actors Richard Karn (ex-Home Improvement) and John O'Hurley (ex-Seinfeld). Currently, comedian and radio personality Steve Harvey is at the helm, and can also be seen with a 1 hour TV version of his syndicated radio show, The Steve Harvey Project, on Centric & BET weeknights.

The question I have for Fremantle Media, which took over the Goodson-Todman properties some years back, is this. Why the merry-go-round? Why change hosts every 3 years? Why not find someone to be the full-time MC? As a certain magazine used to ask in its ad campaign back in the day, enquiring minds want to know!