The 736 at SAS is used all over on domestic routes in Denmark, Norway and Sweden, and for inter-Scandinavian and short European routes.
They are just one size of plane in the SAS fleet - used when the size fits. It may be on a lone daily route or one or more frequencies on routes with 20 daily departures.
When the 736 is too small, then they have -700, -800 MD-80/-90, and A321 - roughly a hundred such planes in total.
When they are too big, then Dash-8, F-50 or SAAB 2000 takes over. Or the flight is handed over to a partner, for instance Cimber Air and their ATR-42/-72.
Always keep your number of landings equal to your number of take-offs