Nothing you have mentioned is, strictly speaking, of any relevance.
Doesn't matter two hoots how long the seller takes to post off an item, all that really matters is the estimated delivery date. Always just have a look at that (and if it is too far off, don't buy, no matter what the seller says).
If the delivery date comes and goes and you don't have your item, you can then open an ebay claim for item not received.
If you're having this constant trouble, week after week, it suggests that the sort of items you're after are ones commonly sold from China. In that case, you may need to be a little bit vigilant before you press the buy button.
Firstly check out the feedback, in particular the negs and neutrals, to see if there is a recurring problem with late delivery or people complaining it came from China and not here etc
Next, check out where the seller is registered. If it is China, you don't have to give them your business.
I don't buy a lot on ebay but over the last few years have had all good experiences and usually quick postage (although deliveries to melb can be a little delayed at the moment, but not too much) BUT I make a point to buy from Australian sellers and I'd skip buying from anyone with a lot of negative feedback.
