If the handling time of up to 10 days is in the listing I would consider it unfair to mark the seller down for postage time. You can always choose not to leave a rating for postage time.

The estimated delivery time, which shows on the front page, would have taken into consideration that the seller has a handling time of up to ten days. If you look at the listing it does show an estimated delivery time of 11- 16 business days so it was quite clearly showing when the purchase was made without the need to click on the postage and payments tab.