You will not have a choice re changing over, it is coming to all sellers, some earlier than others, we didn't move till March this year, but many were moved last year, so inevitable for you.
Why on earth are you out of pocket for post?
You should be incorporating it into your pricing/listing. Either include in the price of your item, or set it up as a separate function so, your listing reads $x + Postage or $x free postage.
And yes, no-one agrees with them taking a % from postage, but this is a topic that has been hashed over many times, eBay will not be changing, so best to work with it.
Do not wait to receive the funds from a sale before posting off your item, we do understand that this is a bit hard to swallow, but, once eBay advises you that the buyer has paid, you must adhere to your postage policy and send. Or extend your handling time, or risk being pinged for late delivery.
eBay will forward your payment in a couple of days.
We were also a bit uncomfortable when we first moved across to MP, and slightly worried with the new delayed payment system, but it has now settled down and $'s are being forwarded to us regularly and without any problems.
Their percentage charged is something that you must work into your listings, no point selling if you are not making any money. If you want to sell on their platform, then they get to dictate the terms and conditions. You may not like it, but, It is what it is.
You could try an alternative platform and learn a new system, or set up your own selling site, which we tried and spectacular disaster! Some very hard, expensive lessons learnt!
We calculate 15% fee, and that seems to work for us with a little padding in the end deduction.
eBay is always changing and can be soooo frustrating - we all understand where you are coming from, but only you can decide whether this site is working for you and if you are happy here. If not then another platform might be a more comfortable site for you, eg Gumtree, (which also comes with its own idiosyncrasies).
It can be fun and lucrative if you can work with the rules and policies that are set out.
Whatever you decide, good luck going forward.
