How about the value of the continually excellent Renault customer power unit? That would provide Red Bull Racing with a good power unit at a fair commercial rate.
On the one hand, could it be said that Red Bull - Renault (and later Red Bull - Honda) underestimated the challenge of Mercedes GP since the beginning of the hybrid era, but on the other hand could it be said, that if Mercedes GP was not in the sport, Red Bull may have continued to be a championship contender?