You comment is silly. The capacity is the capacity. The variable factor is the price. Since it sold out so quickly, the price seemingly could have been higher. That's how supply and demand economics works.
"What you are saying is like saying, if Ferrari worked harder and made an extra 30 million cars every year, we could all buy a new Ferrari for £10,000. In reality, the supply of Ferraris is limited, and those that can afford to pay for them, get them at the market-clearing price.
Re Cardiff, I think it has run its course. The novelty has worn off, and Manchester will be massively better.
The big draw of Cardiff was the social side, and when it drew 40,000 the streets were swarming with people and the stadium had a great atmosphere. We used to go every year, but last year was the first time I'd been for 5 years. The atmosphere, both in the city centre and in the stadium was noticeably more subdued.
Cardiff's racing is never that great, and its notorious problem of not having enough hotels is a problem when Cardiff is so out-of-the-way for many people. Belle Vue doesn't have the same problems as the racing is superb, and being more central in Britain makes it more accessible.
I'm looking forward to these very special meetings on a superb track I can get to in under an hour.