Cinderellas And Rising Prices.

I have recently been trying to add some items to my Cinderella collection, and more specifically to my Philatelic Exhibition Collection.
I have been browsing various auctions and other websites and have been quite shocked by some of the prices. The bidding on ebay has been particularly fierce.

Here are a few examples and then I have a question.

This lot has a catalogue/Market value of £15. I gave up bidding and you can see why !

http://cgi.ebay.com/ws/eBayISAPI.dl...TRK:MEWAX:IT

A similar sheet signed by Pietro Annigoni which has a value of £25, sold for about £85 [can't find link].

The following set of sheets has a catalogue price of £20 but I have never seen them sell for this. Usually they go for between £10-£15.

http://cgi.ebay.com/ws/eBayISAPI.dl...TRK:MEWAX:IT

There is another lot of these sheets on ebay now with a BIN price of over £47 !
The lot shown in the link below has a value of £7 and most often sells for that price or bit over.

http://cgi.ebay.com/ws/eBayISAPI.dl...TRK:MEWAX:IT

I recently purchased one of the three shown in this link whilst I was in London. It cost me 50p.
I wanted to add the set but shock,Horror !

http://cgi.ebay.com/ws/eBayISAPI.dl...TRK:MEWAX:IT

And it goes on and on. True, I have picked up a few bargains, but mostly the bidding goes on and on.

Question.

Has anyone noticed any similar trends while trying to add to their collections ?
What other material has gone on a price hike ??

Please post here if you have problems adding to your collection.

Londonbus1....usually has problems !