Since Ebay has changed the feedback rules for sellers, I will block any buyer from bidding on my present and future auctions if you did not give me a chance to make things right before leaving your feedback. I am not responsible for delays caused by the post office or by the slower method of shipping you chose in order to save money...so, anything less than all stars regarding shipping, is unacceptable to me unless I have greatly delayed the shipping for no apparant reason.
Sellers have the right to set their own prices independently, but some manufacturers place restrictions on how these prices will be displayed or communicated to others.