There are only a handful of copies exist of each issue, less than 10 perhaps in any condition.
Aug 2014: a VG/Fine copy of #10 fetched a very healthy £1,003.17 on eBay UK. Another gem from Sussex based dealer/collector philcomics. Well done sir! I really didn't think it would go for that much when it stalled on £635 for quite a while.
Sep 2019: a Very Fine copy fetched £2,800 in the Comic Book Postal Auctions sale. Fabulous!