VIX futures spread margin anomalous?

I mean it's so much larger, and that makes profits off the usual M1:M2 short-long spread, percentage-wise quite low, no, at least compared to other one-month intra-market calendar spreads? Why? Or am I misreading?

 

Yeah, the spread was <$100 when introduced.

 

Crazy. Not hard to make money off this spread just not enough to get a good return.