I have been reading about peoples experiences regarding sellers jacking up their prices just before various promos begin.
I however experienced the same during the last 20% ebay sale when ShoppingSquare increased their price on the Xaiomi robot Vacuum cleaner.
On confronting the seller regarding the issue, that said that they are not allowed to increase the price on any item 7 days prior to the sale.
What they did was they applied a 10% discount to the whole store because of which which the products are cheaper.
How ever once the 20% promo begins the 10% store discount ends and hence the price appears to be more expensive.
Eg.
The Vacuum cleaner showed up as $431.05 prior to the sale.
I assumed that I would get it for 20% of $431.05 after the promo begins which would be $344.84.
How ever after the promo code was activated the the price of the vacuum increased to $478.95 which is 10% more. (as the 10% store discount ended).
So effectively, the vacuum costs $383.16 which is 20% of $478.95.
This is a loophole that stores are exploiting!
It's not a loophole, it's a business.