I am trying to wrap my head around it also (as is everyone else).

Interesting point you make.  The question is why is it so important to have something pegged?  Who cares?  As @aggroed wrote in a post last night, we dont have much in the way of merchants on here and they are the only ones who care about a volatile currency.  Since they can take payment in other forms, why not let it fly.  

Is the ecosystem hurt if SBDs were to fly to $25 or $50 or $100?  Would that make any difference overall?

I am not sure of the answer but I am inclined to say it doesnt really matter.