People simply don't have enough SBD to keep up with demand. Remember SBD's stability mechanism only gives it a floor, not a ceiling. The ceiling comes only from arbitrage and expected long-term convergence. I'm selling at around $2 on poloniex as I'm writing this.
This is a bizzare way of shining the light on how there's something "there" there. Your attention is overvalued right now so I can do $ value arbitrage by making you read it and having you maybe give me an upvote even if you would be less likely to upvote such garbage than when SBD is at parity because there would be less noise in the stream.
Essentially vote trading kicks in and we're ok with it. Free money and upvotes all around.