Looks like selling in general sucks. Haven't tried selling anything yet but ebay only lets you sell 10 items a month or $500 worth a month (whichever happens first). And some of this stuff doesn't seem to sell quickly at all looking at ebay selling history.
Like I have 35 Shining Legends Boosters if I open things up but they don't sell often at all. So my best bet would probably be to sell like in like batches of 10 for $50? At $5 a pack it would perfectly cover all the shining legends boxsets and everything else remaining would be profit at that point.