We ran a simple study going back to December 2012 and looked at returns in the SPY going out from 5 to 50 days. You can clearly see that buying weakness in the market on an elevated VIX reading has been a profitable trade. We even looked at what happened if you filtered out instances where the VIX stayed above 20 over a period of several days (VIX>20 Filtered) and there was still an appreciable edge.
We always enjoy reading the work of Ryan Detrick and he recently ran a study on backwardation that complimented our own findings.
At some point we will have an extended down move that will leave the VIX elevated for a prolonged period of time. Yet since the end of 2012 this one simple indicator has been
extremely accurate and provided a huge edge if you had followed it.