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@the_hunter04 wrote:

Seriously tho, can sellers just start offering it? would make things a lot easier and smoother!

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Sellers who only send parcels technically can't send registered, though they can send with signature on delivery (a service that is not always provided, though). I offer registered on all of my letter-rate items, because why not, but I get maybe 2 or 3 people a year who choose to pay for it, which is considerably less than 1% of my buyers. 

To be honest, if I was not in a position to be able to purchase the labels in bulk for the reduced rate, and / or could not get to a post office daily in order to buy and / or lodge registered stuff, I might not offer it at all, since it would pretty much do the opposite of making things easier and smoother for the minute percentage of people who specifically want to have to sign for the package, nor for me, and what's essentially "do-able" for the seller also matters.

I never used to offer express, because I couldn't guarantee fast dispatch for various reasons (namely, lack of petty cash, since I try to keep the bulk of my funds in non-immediately accessable places...), and it's only since I could purchase express labels for post-paid flat-rate satchels online that I put it on the majority of my listings.