The term 'padded envelope' worries me. Is that a bubble envelope? If so, do not use that for stamps if you put stamps on the cover. The stamps on the cover have more chance of getting poked through and ruined somehow.
If the bubble or padded envelope is being used to provide moisture protection, then that is a good idea but would be better in a ordinary envelope with cardboard or corrugated plastic stiffener plus with a plastic bag for the stamps. Just printing 'Please Do Not Bend" on the envelope is no good. Make the envelope non-bendable as much as you can without unduly affecting weight or cost.
Some use zip-loc bags of different sizes. I like clear plastic, thin, different-sized bags that I just fold over at the end and crease from
ebay seller uniquepacking. Looks nice and prevents dirty fingers touching the treasure while still allowing people to see what they have just received.
$2.25 might be a bit much. I notice a lot of US sellers charge $1 - $1.95 within the US. Some charge extra per piece but some don't.
Oh, if you are using the padded envelopes for coins and money then that is a different matter of course. Stamps should not be shipped in them though, well, maybe kiloware.
I like the idea of going by the weight of the item or items. Extra work in packaging and weighing to get the proper weight so to charge the proper postage though. Easier to just add a figure on. $0.10 - 0.50 per piece seems to be the norm, depending on which you feel covers your costs including losses of course. If one goes over 0.15 per piece that seems to discourage buyers somehow. Not all but just some.
Depends on what you are selling too.
Some sellers charge a flat rate that covers their cost on most but they loose on some orders. Evens out to be OK though.
Registered is a turn off to buyers I have noticed as everyone feels they are to be trusted and nothing will ever happen in between you and them, and if it does then well it wasn't their fault now was it? Some do not mind paying it but after a while it begins to grow tiresome for the buyer and he begins to look elsewhere I feel.
You could offer registered mail being up to the buyer to request but I am not sure on
ebay's or PayPal's rules on if that slips under the rug and lets you off the hook. Probably doesn't because they are so good at leaving the whole mess up to you, their customer.
Thanks to palaniappan for the mention of always using registered. Some circumstances do demand it. Country of origin or country of destination are factors to consider. Learning to address mail correctly for different countries makes a big difference in how that mail is handled and delivered or not. Cost of registered is low in India (#3.00 USD) and other countries compared to say $13.00 CAD (or USD) in Canada or other countries (plus PayPal ++ fees if deemed necessary and bearable by the customer)
Sometimes I think a registered piece of mail attracts undue attention because there must be something valuable in it. Sometimes things fall off the truck or boat or plane before they reach their destination. A lot of that happens in the country of origin too (Canada , USA, UK, etc) rather than at the destination.
If you sell a lot if may be worth while to look into your own private insurance for your business. In Canada the
Canada Post does not insure used or mint stamps or coins. It looks like you have $100 worth of insurance no matter what you stick in the envelope but read the fine print. Good for tracking and proving confirmation of delivery though.
You may be able to tell by my rant that I have quite a few gripes about things and how they are done. The best way to tell that you are doing something right is to have customers tell you, hey, that was good the way you shipped that.
The darn feedback on
ebay is a pain and the only way to get automatic 5 stars on shipping is to give free shipping but unless you have people sending you money for no reason just because they like you then that is a hard thing to achieve.