Lots of shows don't sell out . there were hundreds of free tickets all over the place at Hampton 2013. Portsmouth is similar capacity to this place and I don't think it ever sold out before day of show in however many shows there.

It seems like fans are a little slow to come to the realization that this band is roughly half as popular as they used to be outside of a couple core and destination markets, but the band undoubtedly isn't surprised by only selling a few thousand tickets in texas