It likely has had a banner towing hook and controls installed. I didn't think that required special licensing, though. He might be selling the "business" along with the airplane, hence the high price?
Regardless, unless you want to go into business (got a commercial license?) the hook and linkage is of no value to you, and is extra weight that should be removed ..... more expense. A DAR could restore the normal registration after an inspection ...... still MORE expense! Don't fall in love with the idea of owning this particular plane, Tim. There are plenty out there. Be patient. Buy THIS plane only if the extra cost and hassle is worth it all to you! Low time isn't everything!