I am only familiar with wood framed pole buildings, as I worked in the building supply business for 42 years before retirement. We were a major supplier of pole building materials both to consumers and contractors here along the north Oregon and south Washington coasts. There are many things that can vary the cost and integrity of a pole structure, particularly in high wind and heavy snowfall areas. Important things to consider: Is the building engineered including the trusses? What grade and pressure treatment method are the poles and skirt boards? Also, what grade are all the girts and purlins? Many of the 'deals' I have bid against over the years include #3 poles and framing materials with an 'above ground' treatment process on the poles and skirts that will be in the soil. Around here, if a pole building is outside a municipality and used only as an 'ag building', a building permit is generally not required, which leaves a lot of wiggle room as far as quality and quantity of materials. In the end, the customer should do a little homework and become familiar with what is acceptable to him.