A stellar 11 years on "M*A*S*H"
Most of them wearing a dress for cheap laughs.
plus memorable guest appearances as a judge on "The Gong Show".
Many people would not consider this to be a high point in a career.
Why jeopardize memories of that when hosting a dating show?
Didn't seem to harm the careers of Jim Lange, Chuck Woolery, Arlene Francis, Bill Cullen, Gene Rayburn, Bob Goen, Bob Eubanks, Dick Enberg and many, many other successful performers who've hosted some kind of relationship show at some point in their careers.
The point being, just because YOU don't happen to like "dating shows" does not necessarily mean that someone's legacy is in jeopardy for trying one. Performers perform. You aren't going to find too many who see easy work for a big paycheck and say, "Hey, I was a panelist on The Gong Show. This is beneath me."