For the number of years I've been into K-pop, large named groups/artists went on SBS The Show (on Tuesdays) and even MBC Show Champion (on Wednesdays) for ages.
Then they kind of focused more on the bigger chart shows; Mnet M countdown (Thursdays), KBS Music Bank (Fridays), MBC Show Music Core (Saturdays) and SBS Inkigayo (Sundays).
However, The Show and Show Champion are cheaper to get a performance spot as they are the less popular shows. Thus, many rookies go on these two chart shows most as their companies may not be able to afford the other four.
As such, The Show and Show Champion have built a rep and stereotype of being "rookie chart shows".
I was surprised to see RV on The Show today after having not been on for awhile, but it's not out of the norm. :)