I feel you bro. Yeah that's exactly what they do, making you believe that you have 10% chances to win. They should mention a chance to win a rare item or something similar, now they just show you items that appear to be all in the same category it terms of rarity.
In fact your chances for a skin is ~1% which is based on my experience and also from people I've talk too. Same goes for other lucky boxes. That % would make sense, because when x10 on DB skins some people can win ~5 skins for 50, not for me though I barely won one.
No luck at all on specific boxes more than 50k there as well. We have to make them chance something. I've heard there are specific class boxes with enchanted chances haven't seen them yet, but if they exist in fact maybe that would be a good time to get a skin, or not..