B2Bs are expensive! Why do you think some crew haven't done one in months? Because BA is giving nightstops on the eats coast instead because it's a cheaper alternative.
Middle Eastern B2Bs also seems as a very expensive alternative.
Scheduling a crew member to do a 3 day KWI with two days off followed by a 3 day RUH with two days off is a lot cheaper than letting them to a 6 day B2B to DXB and JED which includes B2B payment, LHR accommodation and THREE days off.