Just in case you ever wondered, buyers ARE notified when you run sales on eBay. I don't know the exact process or algorithm, but I have received 3 emails in the last week for items with price reductions.
Best I can tell, these items were reduced using Markdown Manager. These items were not on my watch list. They were actually items I had viewed when doing store critiques for other sellers. Here are the emails, just to show you:
These items appear to have been marked down using Markdown Manager. See how they say discounted "for a limited time?"
The first item, the silver dress, has been discounted 25%.
The second item, the teal colored dress, was discounted 10%.
The doll was discounted 18%.
So this is the buyers' view for these items that were previously viewed.
Moral of the story:
If you run sales using Markdown Manager, buyers who previously viewed the item "may" receive an email notification.