Deep breath.
If someone is buying a piece of chocolate from a shop, there is no shill bidding, systematic or otherwise.
If someone is bidding on an auction item, I am sure there is an element of shill bidding. I couldn't possibly comment on how systematic or endemic it is.
You said earlier, "Shill bidding is a boogie man and only practiced by the ignorant and foolish", so the fact you say it is practised suggests it exists.
But, even though I must admit to losing the will to live, all I was initially pointing out was that chocolate is mostly bought from shops, and not bid on at auctions. A none comment if you will, and not at all deserving of such interest or discussion.
Cheerio.