How Do You Explain This Combination of Purchases?

I was shopping at Overstock.com and noticed that "A People's History of the United States" was in their Top 100 sellers. Good news, given how long it's been in print.

Then below the blurb, I noticed this follow up:

Customers who bought this item often buy...

Angels & Demons
Our Price: $3.59 List Price: $7.99 You Save: 55%
When a canister of anti-matter is stolen from a Swiss research facility, Robert Langdon is called in to investigate. A Harvard professor, Langdon is an expert on the ancient, quasi-scientific, and widely feared organization know as the Illuminati, wh...


14-kt. Akoya Pearl Earrings (5.5-6 mm)
Our Price: $19.99 List Price: $90.00 You Save: 78%
Every woman needs the classics in her jewelry box, and these cultured pearl earrings are a great place to start. Akoya cultured pearls (5.5-6 mm diameter) rest in polished 14-karat yellow gold. The post earrings have butterfly backs.

14-kt. Freshwater Pearl Strand (6.5-7 mm/24 in.)
Our Price: $59.99 List Price: $450.00 You Save: 87%
Make a classic statement with our 24-inch cultured freshwater pearl strand. Our low price makes it easy for you to add this jewelry essential to your personal collection.

Euro-Pro Manicure and Nail Dryer Set
Our Price: $19.99 List Price: $79.99 You Save: 75%
Get a professional looking manicure at home with the Euro-Pro manicure and nail dryer set. This set has everything you need for a manicure in a compact and convenient case, plus the case has a built-in nail dryer!

14-kt. Black Pearl and Diamond Earrings (.02 TW)
Our Price: $49.99 List Price: $145.99 You Save: 66%
Indulge yourself with a pair of black pearl and diamond earrings. These 14-karat yellow gold leverback earrings feature 6.5-7 mm cultured pearls with twinkling diamonds.

Very strange. Although, on the other hand, if it indicates anything at all about who's buying Howard Zinn these days, it could be extremely good news.

On Amazon, the first few weeks after a Harry Potter release, just about anything you click -- a frying pan, a flash memory card, Tickle Me Elmo, War and Peace -- you will find "people who bought this also bought Harry Potter." Because everyone bought Harry Potter.

Still, pearls? Yeah. Odd.

More likely, those items are nice margin items, that they hope to sell a bunch of.

The people purchasing these commie-lib books are all pearl-wielding terrorists!

Carefully manicured anarchists with pearls!

...of the purchases of 100 or 200 people who bought the Zinn book.

Notice the wording: "Customers who bought this item often buy..."

Not "also bought." Yeah. Deceptive.