Why do upped versions of towers and pendulums have a reduced chance to be spun? I can understand this for unupped versions, since they have such a low value, but for upped ones, I'd -love- to win more upped towers or pendulums from FGs. (or halfbloods, for those who play those) It's not like it matters much for selling; all upped cards are worth pretty much the same, and upped towers/pends are the basis for virtually any upped deck.
If they were treated the same way as the non-Pillar/Pend cards in spins, then you'd win them way more often than the other cards. Also, your chances of winning a card would probably also be reduced (since there would effectively be more cards to choose from in the random selection of cards to put on the reels).
There was a time in which Quantum Towers weren't filtered out by the spin mechanics, so if you won against Rainbow, then it was highly likely that you would win Quantum Towers from the slots, and less likely that you would win something else.
From the perspective of achieving Jmizzle Status (12-24 of each Pillar/Pend, 6 of every non-Nymph/Mark card), then it would be more advantageous to get a variety of upped cards from the spins.