Fair comment. But remember that 60% of pax using Liverpool are travelling to LPL from outside the Merseyside region. (airport's own figures).
Which suggests that those driving from the North, the NorthEast and from over the Pennines or even Greater Manchester, can access Blackpool in the same time it takes them to drive to LPL. And as we all know, people will go anywhere if the price is right.
With an under used BLK Terminal they could call their own, who knows where that might lead. That 100m r/w extension could open up all of Europe