The problem with affinity in vintage has always been null rod. Null rod turns off your deck, your manabase stops working, your creatures don't do their thing, and really, a bunch of free 2/2's and 4/4's aren't all that scary, especially when you can drain them for 7 mana. Building affinity with a non artifact land manabase could work, but it slows the deck down which takes away from the whole reason you were playing affinity anyway.
Null Rod and Mana Drain are rarely, if ever, in the same deck. A teammate of mine plowed through 6 rounds of swiss with Crushing Chamber a few weeks ago.
It's a gamble, but often times people just hope not to play against Shops with a real clock.
I am excited about these new Alara blue artifacts. (Orb at 4 is better than Orb at 3U I'll admit)
I am annoyed that Painter decks can REB these artifacts without Painter online.

Then again, Chalice for 1's stock just rose.