This is from their bucks page, perhaps you slipped thru the cracks. Your purchase you show though on 9/16 only shows you got $100 in bucks. Are there any limitations on how many eBay Bucks I can earn?
You can earn up to $100 in eBay Bucks on any single eBay purchase. This means that if the eBay Bucks earn percentage is 2% and the purchase price (excluding tax, shipping fees) is in excess of $5,000, you would be restricted from earning any more eBay Bucks for that purchase beyond the $100 eBay Bucks purchase earn limit.
I'm with you now. You spend $1,000 only because over that is diminishing returns. I remember now, I had the same philsophy last year. On the 7 bars it had further price break so I went ahead. Sorry, it's been awhile since I played the ebay game.
Things may dry up for us now that it's a redemption month. On the bright side I heard Facebook is launching their own marketplace to rival eBay. Hopefully that means an increase in the bucks frequency.