From what I know the Orbit channels along with the Rotanna channels bouquet are just some of the premium channels in the Middle East, so SymbolRate your a bit wrong.

Some channels might be available on C-Band and are FTA but it's hard for most people to hoist up a C-Band dish for one or two channels - UBI bringing them to KU-Band allows everyone to enjoy them with a smaller dish.

MBC 2 or MBC 3 - are under the MBC banner are exclusive to WMI in this region

Space Toon Arabic too much content from Cartoon Network so unable to bring that channel in this region

Al Jazeera Sport too much content owned by Fox Sports, ESPN and etc in this region

Showtime not allowed as all movies are owned by either The Movie Network Australia or Showtime Network Australia

SymbolRate I suggest you read up on what exclusive and non-exclusive broadcasting rights mean in the pay tv industry.