Seems I've written about this before.
But I did buy another 10 booster packs.
And I will probably do it again before the 10% SP-back offer expires at the end of this month.
Only one legendary in 10 packs, and I already had it. Should I sell it? Should I wait and upgrade if I get 3? Hmm, will see. Well, at least I found one or two epics I didn't have.