You don't earn miles with group flights? Since when? Or do you mean because they book tickets with miles they bought from people?
Alot of times the Airlines gives these Agents very low rates. A friend I sent to Global got an ElAl tkt for Pesach to TLV it was a few hundred cheaper then what ElAl themselves wanted but after I mentioned about not getting 100% of the miles called Global and was told with ElAl and his fare basis hed only earn 50% of the reg amount of pts.
As for DL or CO you need to ask the agent what the fare basis is and then go check that carriers T&C to see if youd earn anything.. Yes both DL & CO have fares such as these where you wont earn even 1 eqm or 1 rdm
Same with sites such as Orbitz where they mix fares at times I saw that Id earn miles only in 1 direction since the other direction had a fare basis that didnt earn anything. This was on Air Atalia and another time Czech Air. I simply got the fare basis off the orbitz site that someone showed me how to find it and then looked it up on DL and CO and both werent gonna give credit on 1 direction
this has nothing to do with getting an award tkt from a broker