Most of the times its because there the lowest price, and the listing may have a lot of purchases with is a variable for rankings. Theres no software for being on the top of the page.
Being a Top Rated Seller helps. Price is a factor, feedback is a factor and offering free shipping helps. But nobody knows the exact formula. Knowing eBay, you be be sure that whatever it is heavily favors the big megasellers.
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Because chinese rocks!!!Look around the world you can't find anything chinese not involving to can you??Lol..
Just joking.it might because they selling cheap and use good-til-cancel listing n sold a lot to keep it stand a head in search result,you can start to build it now and your listings will moving up slowly.Remember the seller performance as well,that effected.
Well,it depends on the CTR.As above said price is a factor.Lower price would increase the purchase possibility.When 10 vistors saw your listing and one of them made the purchase.That means your CTR is 10:1.Your listing will be in front of those listings which the CTR is lower than yours.Well,there are some of other factors like TRS.But CTR is the most important.
be sure that whatever it is heavily favors the big megasellers. .
"Best match" is pretty slanted towards bigger sellers. And its set by default on searches
There are other reasons that bump you up as noted. Like free shipping. Auction gets priority over BIN because fees are higher. But most of it boils down to eBay preferring some sellers over others
I think its a combination of factors, however you have to trail and error. Chinese sellers may sell cheaper than non-Chinese however they have to wait far longer to receive their merchandise, as time is of the essence I am sure people would rather pay extra than waiting 7-15 days..
Why chinese sellers' listing alway on top of page. 
