@shakey you just went full Ed Miliband on me ... ditched my questions and asked/answered your own !
A lot of your musings are the basis of my questions ...
Now unless non riders are stumping up £40 in their droves or all those families with non riders are still coming and leaving Grandma behind, then the answer has to be , they are making less money . And even if people are leaving non riders behind that's still lost revenue for the park on entry and secondary spend.
I am not convinced that there were droves of non riders to begin with, but from this it suggests that you think there might have been ? If there was a huge market for the Pleasure Beach Pass / Diamond Thingy, I am not convinced that they would have got rid of it.
If for example ... the split was 98% wristband / 2% Pleasure Beach Pass (the latter of which I suspect is on the high side) and you worked on the basis that the average revenue for a wristband was £30 (after group visits, season passes, discounting etc) and a PBP was £10 (which was the peak). And for simple maths we'll work on attendance of 500,000
Wristbands - 490,000 guests @ £30pp = £14,700,000
PBP - 10,000 guests @ £10pp = £100,000
Total Revenue = £14,800,000
Then ... you remove the PBP offering. With those assumed numbers, you only have to bring a third of the grannies back at full price to maintain your revenue. That doesn't sound unachievable to me, neither does attracting 1 additional rider for every three bag carriers that you lost to make it up.
Goodness knows why the scanners are there - but if they were going to bring the Pleasure Beach Pass back, I feel like they would have done so by now. If they sold that many, it made that much difference to the bottom line and there are that many people not coming back because of it, who spent lots of money on park, it makes no sense to me that they wouldn't offer it.