Some traditional spade ends sell very well - e.g. Super Spades. Others - smaller/lighter hooks - not so. Barbless generally outsell barbed. No surprise. What distorts figures is loose hooks to tie yourself and pre-tied. Some loose hooks are very poor sellers but the pre-tied versions are excellent (e.g. Carp Method).
Carbon Chub. Great hook - in it's day. Very, very popular. Discontinued. Why ? Didn't sell any more. Sad but true.
Can I ask where you take these overall sales figures from? Not that I dispute them, just curious where they come from.
Surprised about the Super Spades - they struck me as brutal, with rank barbs, but that was a long time ago.