Well out of my price league, but I'm glad LGB are still around and releasing new models.
Thank goodness there's a plentiful supply of secondhand rolling stock coming onto the market as older people downsize. Like the Bachmann Shay for £250.
Re: inflation, the price of beer is influenced by duty, which is an arbitrary "sin tax" set by the government. Mercifully no sin tax on model trains.
Using the Bank of England's general inflation calculator, the £3500 Shay would have cost:
£1,152 in 1985
£1,735 in 1995
£2,017 in 2005
£2,582 in 2015
Personally I think LGB products are moving into luxury goods territory where what matters is the price the market will pay and has very little to do with the cost of production.