Hi there and welcome!
I am completely biased on this (of course being an ower who is planning to sell) but I'll give some thoughts for starters.
It's a modern classic, and with limited produced (102 made and less than 20 in the UK in total it is always going to hold it's money pretty well.
I think like all cars the depreciation curve at the start is always likely to be the worst time, and as we have seen since they were released in 2008 the prices have stayed pretty stable. Dropping around 15% ans staying there, with most UK cars coming on the market priced between 90 and 100k depending on colour and condition.
My tumblr account has just about every picture of every Aeromax ever produced and photographed on it, and from that I've been able to deduce that around 10-15 went to the US, 25 were sold in the UK or so. Collectors in ASia and Europe picked up the rest.
There is one example I know of in Australia (Richard Hammonds car went there last year).
LHD cars in Europe come up occasionally and seem to trade at original list in the region of 130k Euros.
A good number of the UK owners post here, and this is probably the best resource on the web for information on the Aeromax.
The only reason I am planning to sell mine is that I've got a growing young family, and I'm just not getting to use it that often as I need 4 seats everywhere I go these days.
Money and garage space no object I wouldn't be considering letting it go. As a car to be able to use regularly but feel incredibly special at the same time I don't think there is anything out there to touch it.
