[babylonian]

I promise shipment within 72 hours of payment. Daily trips to the post office is a real drag. This eats up work time. I cluster my auctions, posting them only one day per week. This means 50 or 60 auctions expiring at the same time. By waiting to ship on the third day after the auctions, I have a decent number of paid customers to justify a trip to the PO. Otherwise, I'd be standing in line every day at the PO with only a few packages each day. What a waste of time. Still, I have 1200 positive, glowing feedbacks, and no negatives. And every one of my customers gets their merchandise, including the approximately three dozen or so which are "lost" in the mail, annually. I have to eat those situations, and ship more merchandise again, at my own expense.

[strela]

I promise shipment within 72 hours of payment.

If that is understood by both parties before money changes hands, then good for you and for them, and they've got nothing to whine about.

[btcusn]

I have no problems with your method of shipping as long as it's made clear to the purchaser at the time of sale. Did you ever consider UPS and have them pick up the package at your home and add the cost of shipping to the product? Advising the purchaser in the ad. of course.
Jack