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@1688storewrote:

As a seller you should never be negative to yourself and other sellers. Instead you should be thinking positive about how you can sell efficiently and worry less about how others sell.

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Here's the thing, though - no one here is worried about how you sell. Everyone is trying to show you some alternative strategies to deal with the situation you've brought up, because they want to help you sell in a way that doesn't lose you any sales, and mitigates the odd lost package.

Criticism of your methods, theories or ideas is not actually a negative thing, even though to many people it can feel like it because they take it personally. Well thought out and constructive criticism does not mean someone dislikes you, or doesn't want you to do well, it means they either disagree with a method or idea, or know / have different ideas, and therefore want to highlight some of the negatives in what they're disagreeing with, and the positives in the way they approach it. 

No one here expects you to listen to everything that's been written, and follow every last bit of advice given, they just expect or hope that it's treated with an open mind and that you take what you can find useful to you and improve your selling on eBay experience. 

Criticism can be one of the most positive things you will ever get from other sellers, because it shows you different perspectives to look at a situation from, and can provide ideas that help you improve. 

When you sell online, particularly when sending the items via large letter, you have to look at something called risk vs reward. That means you assess the risks involved, and work out whether those risks are worth taking for the reward. 

In this case, is the $6 you gain from all the sales of the item worth the risk of having to refund one every so often? If it's not, then you need to look at whether adding $4 for registered only postage options is worth the risk. It's already been established that it's not, because the result would likely be a sharp drop in sales and while there would be much less risk, there would also be much less - or no - reward. Does increasing the price to $6.30 instead make the risk worth the reward?

I can tell you right now, neither eBay nor PayPal will ever introduce an option that allows sellers to deny responsibility if they can not prove postage (or delivery), so you need to weigh up this risk:reward ratio and decide if you can accept those risks, and if you will, you then need to decide what strategies you'll implement to try and reduce those risks.