Alternative vote referendum

We just had a flyer from the NOtoAV campaign.  The arguments they use are pretty laughable.  The worst one was:

"Someone else's 5th preference is worth the same as your 1st preference"

So presumably then, my 5th preference is NOT worth as much as their first?

They go on to point out that AV would encourage candidates to pander to the wishes of the 'fringe parties'.  I think they are worried that the candidates might actually pander to the wishes of the average voter, who is certainly not represented by the main parties!