It is worth signing up for. I had put it off then finally signed up 6 months ago.
The other neat thing is they send you special promotions that usually last 2 days or so where you can double your
ebay bucks on purchases. The closer you get to the end of the quarter (
ebay buck are earned in 3 month cycles), they send out more promotions.
Just had one recently to get 5x on purchases over $50. Does not include bullion as someone already stated. The norm is 2% back on purchases, sometimes up to 10%, depends on the promotion.
I got a free $9 coupon a few days ago. free is free!