Dark Summon AA chances?

I've done a lot of them and have managed two Manus, a Taroth, and Slaughter Doll to my recollection (or Vlad, one of the two). Am I extremely fortunate or are the low odds grossly exaggerated? I mean between my experience of getting one in every twenty or so (give or take a few)and the large number of AA cards on the AH and used in formations I have to believe they are grossly exaggerated. I only ask because I may be getting some soul points soon and don't know if I should spend it on EP (which is grossly expensive) or cards from summons (which are considerably harder to move if they're not an AA).

Ateam change DS into Epic DS and "forgot" change back.
So of course the rate getting AA greatly increase

Nah you're just super lucky, not including the hundreds of free dark summons I've done, over the couple months I've been playing I bought roughly 150 dark summons and have gotten a moon sea and devoid. I quit using soul points on summons a while back.

It is worth noting that both Manu were summoned during the choose one of three cards campaign a while back.

I must be very lucky then. I've gotten 4 off free ds. And 12 from purchased.