If you are talking about the Shard Shop, i traded in 5 Sidious shards into the shop and got 75 shard shop shards, so 5 shards for 75, but it costs 300 for 2 character shards, which tbh is a kinda jip!
I think it depends on the * rating of the base unlock. I just had Fett drop from a Bronzium card, and as I had already unlocked him, I was granted 22 shards (which leaves me 1 shy from getting him up to 5*s until tomorrow, if I get at least one from one of his nodes).
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Was wondering again what the rationwas I think I got this IG88 drood already. The one we got from logging in
IG-86 is the tutorial droid but if you haven't 7* him the character 8s converted into shards so instead of 15 x IG-86 shards you get 22
Edit: Never mind, the guy above explained it.