As far as I understand it - just regular pax and never worked in the airline biz - FR do not carry freight as it would delay the turnaround.
Yes their prices are sometimes not cheap, sometimes they are. Just like most of the rest. As a carrier, they are super efficient at carrying pax and making profits. They have the advantage of being the 'first mover' in this area in Europe. They were the ones who changed the game and so made more money. They have also remained ahead in their thinking and stayed in front against the competition. They are the market leader. Whether you like their game is another issue and many threads in here are dedicated to that.
Freight was the obvious next stop for terrorists:
- Pax hijack and deliberately crash. Worked.
- Pax try small devices in the cabin. Failed.
- Freight is unprotected. Almost worked, save for a tip off.
One of the routes that they have not yet used, but doubtless considered, is the shipping container. The problem is that a ship sinking at sea would not get as many headlines and if the ship was in port - the container might be in the middle of 60 others that then absorb the blast. There will be other routes and, as the IRA famously said, they only have to be lucky once.