If a Muse gig sells out, some fans will always be disappointed that they didn't get tickets.
A logical way to help dedicated fans get tickets (i.e. those on the mailing list of members of the forum) is to have a lottery system and allocate a percentage of all tickets randomly and then selling the rest on general sale to the public. I don't know how anyone can not see this as a good thing as it's fairer for all fans.
A first come, first served "rubgy scrum of F5 pressing" is hardly fair (what about those that work and can't get online? Or those who aren't very good at typing their address details really quickly?).
Regarding the pre-authorization of payment, this is a very common thing. Having worked on credit card payment systems and handling pre-authorisations it makes perfect sense. In fact, it's how credit cards and banks work. Here's an explanation...
The ticket agency checks your bank/card for funds. If you have them, yay! The bank/card issuer reserves that amount of your available credit for the ticket agency and your remaining available credit is reduced. It doesn't matter that the transaction hasn't completed yet - that money is now reserved (this is called a pre-auth) and you can't spend it on anything else (for the time being).
(This is why if you have a card with a £1000 limit you can't run off to Tesco and buy 500 things at £100 each... you'll be denied after the 10th one as you'll have run out of credit).
Hotels work in the same way. When you check in they pre-auth your card with the amount your stay will cost (you know, to check you've actually got the money) and this money is reserved for them. When you check out, the pre-auth is either completed, or if you had anything from the minibar they might cancel the pre-auth and resubmit a request for the payment at the higher amount. It's at this point that the payment is actually requested.
So back to the tickets, if your application was successful the pre-auth will be completed and the transaction is finalised (and it will show up on your statement). If you were unsuccessful, the pre-auth (the money that was reserved) will now be reversed/cancelled and the funds are available again.
Whilst your amount of available credit may go up and down, the money is only actually taken when the tickets are bought.
Incidentally, if you applied more than once, or hit submit multiple times, this is why your available credit would have been reduced drastically as the ticket system will have initially have pre-auth'd all your submissions. It would only be when the duplicates where discarded that the pre-auths would have been cancelled.