Military Post Flea Market

Has anyone tried the semi-annual flea market that most military post have each spring / fall?  Just saw advertisement for the one near me.  Cost is much higher then normal flea but I wonder if traffic is higher also.  10x10 spot, corner spot is $55, outside drive-up and park $45 (one I'd get), and inside isle spot is $30.

I remember doing this one year when I was young and father was in the army.  So I know the crowds can be large.  Plus it's the first weekend of the month - so military will be paid.