CC Mayday Or C&CC Arrival Breakdown and

Out of interest I did a cost comparison. Can it be correct? I have top level cover with Mayday using Green Flag including home start and personal cover. Cost £126. 

A quote for the same level of cover with CCC Arrival is £298 (but until march 2015 does include free CCC membership.)

Arrival two and a third times Mayday? Can this be correct? 

(P.S. I shan't be following the topic but thought other  may be intersted)