In my very own opinion, it does not depend on “selling similar” or not. It is just that GTC listings literally go buried after some weeks and a large % of buyer follow categories and so pick newly listed items. GTC are never shown in categories as newly listed, except when you list for the first time. That’s why I always used the relisting feature in GS. That’s not “selling similar”, but for me worked anyway and I always sold listings that have been relisted several times before and went unsold. The problem is that managing thousands of listings with auto-relist option is quite complicate, besides not every kind of good is fitting auto-relist. I mean, those kind of goods of which there are millions of similar over ebay (like postcards) make sense to be auto-relisted (for many reasons). On the there hand, very specific relics or objects, which are unique or almost, make more sense to be GTC because they collect lots of click and follower and one day will be sold because they will be visible due to elevate “traffic” and not buried as a single postcard similar to other hundreds from bigger seller. At least, this is my theory… and no, I don’t think there is the “sell similar” option in GS.