Hey Flip,
The stocks with options which trade on thinner volume use wider spread strikes. As interest increases, the options gain in closer spacing of the strikes and more availability in back months(leaps). It wasn't until Mar 2011, if memory serves me , that AGNC got our first Leaps in the 13Jan, which we are in right now. I thought at that time, wow, 2013, that was way out there, and here we are...;-)
The MM's don't want to waste their time fooling with a bunch of strikes if no one is interested, is the basic answer to your question.
Hope that helps,
DocReits