Ever want to say "Next time you try to screw me, at least kiss me first."

I am selling a not quite 2yr old Lumix 100-300 lens, that is in mint condition, because I have Kipon EF to MFT adapter and now use my canon 70-300 L on my Olympus EM1. I might have used the lens 3 or 4 times, has $110 high end UV guaranteed no scratch filter.   I checked all the places that are selling this lens used, sometimes without the filters, and priced mine $50 less at $450.  For 'mates rates' I was willing to sell them as a package for $400

Yesterday, someone insultingly offered me $300, maybe $400 if I included a $170 scratch proof high end CPL filter and the $110 UV filter. 

Read post title for my opinion of that.