That's roughly equivalent to £100 in UK money, so it's about the same price as the Dame Vera Lynn Trust 10th Anniversary Ball in London earlier this month. These events are really aimed at corporate companies and sponsors rather than fans.
When I first heard Hayley live, more than seven years ago, I fully expected we would always be paying that sort of money to hear her by now. Her concerts are terrific value for money and always have been. You only pay a bit extra to support a worthwhile charity, and if you can afford it, why not?