Shine, I agree and sympathize, especially when you have a tax man who's out to get the property owners. It's a shame you can't vote him out of his air conditioned office!

Gary,
Your pole barn space is constructed like mine and lends itself to shelves between the support posts as you've done. However, I'd suggest that you install at least one intermediate support on those shelves or you will likely walk in to a bunch of stuff on the floor one day. They're already sagging under the load, and it will get worse over time, guaranteed.