The way I look against it, is that the festival organizers learn from eachother. When we started to introduce the vouchers in Holland(2002), we got a lot of resistance from the visitors. Now the system is well known and the majority of the visitors don't seem to badger at all. They are still paying some extra for a older or exclusive dram and a voucher in Holland will costs you €1. Now in my eyes it seems a reasonable price to pay for a voucher. The thing is that some distributors, merchants etc ask about 5 vouchers for an older or exclusive dram. But the other side is that a lot asked more then 10 vouchers up to sometimes 15 vouchers. You might ask where you draw the line.
Another thing is that we can't expect from the distributors, merchants, etc to sponsor all the older or exclusive stock. We just simply can't and I don't think it's justified to expect that all the suppliers will give it all for free. There's to much money involved in that, I know that there budgets but believe me that these budgets won't stretch that far. And some producers/distributors can afford more then others.
Now if you pay 28 GBP entrance fee including 12 vouchers sounds very reasonable to me and 28 GBP is roughly about the same entrance as in the Holland. Now if you visited the event in Holland, there's lots to taste for free(included in the entrance fee). But if you pay 28 GBP for the entrance fee, including 12 vouchers and that's it, then I would say that's pretty expensive. I mean does a very exclusive dram will cost you one voucher

Or does it - like Dennis said earlyer on - cost you more then one voucher

By the way, what will the price be for extra vouchers, 1 Pound

I think that even 1 GBP or perhaps more is just a very little bit on the dearly side, just a tiny bit. Because right now I can see the prices in front of me for the amount of vouchers they'll ask you: "One Bowmore 25Y old sir, oh uh yes please but what's the price? Well sir that's 5 vouchers please for a smashing 20 ml (or 25 maybe)" Conclusion, perhaps 5 GBP or maybe more(depending on the price for a voucher) for a 25Y old Bowmore. I believe in Holland you'll probably pay €4 or 5 for a 25Y old on average(that's 2 to 2.5 GBP)
I think there should made some price agreement with the producers/distributers about what to charge for some older or exclusive whisky's. Again, they dont have to do this for free but lets keep it reasonable. And yes I know that everything has its price.
To be honest I never attended the Whisky Live event, but I did follow the enthusiastic stories from others who did went to London. And they told me how things went overthere and what to expect and what the prices where etc. So in a way I had a little taste of it. I personally would love to go to Whisky Live once, especially when people, like Dennis for example, tell you enthusiastic stories about this event. But then again I found out that staying in London is quite expensive, about 80 quid a night I believe in some hotels. The flight in the otherhand is very very cheap(Thanks to Easy Jet, Ryanair and others).
Who knows on one day.....
Cheers,
Erik