Recently, I bumped into a few items on eBay for which the system wasn’t showing eBay Bucks. First there was a certain business electronics item which I purchased and didn’t earn me Bucks, then Orensmoneysaver posted about some boxing tape which isn’t showing Bucks either. I was mystified as to why these items weren’t showing eBay Bucks and – in my experience – they indeed were not earning Bucks.
Mystery solved.
Anything in the Business & Industrial category does not earn eBay Bucks. They probably don’t want to give Bucks for business purchases, only for personal use items. This category is probably the most common Bucks exclusion for most of us (who aren’t mechanics), besides the eBay gift card exclusion.
Good to know.

