Does anybody know why this 50p International Sporting Club chip sold for £51 / $102????

Link to ebay:
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=320147223239&ru=http%3A%2F%2Fsearch.ebay.co.uk%3A80%2Fsearch%2Fsearch.dll%3Ffrom%3DR40%26_trksid%3Dm37%26satitle%3D320147223239%26fvi%3D1

Also how much is this £1 Crockford’s Casino chip worth?

Link to ebay:
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=200143087956&ru=http%3A%2F%2Fsearch.ebay.co.uk%3A80%2Fsearch%2Fsearch.dll%3Ffrom%3DR40%26_trksid%3Dm37%26satitle%3D200143087956%26fvi%3D1

Sam