Have you ever been blocked by an E seller here?

jl35.

I would love to see someone pull that stunt on eBay.
I dare say they would not last an hour before having ad removed.

I do not see why here should be any different.

Again, to me, only final price matters   I know others feel differently 

They do it on eBay all the time simply by raising their price 13%

Its all about how it is presented though.
Kidology definitely.
But it works

Yes.  I found a vintage tube amp listed for a fair price.  I sent the seller a message expressing my interest, and I asked several detailed questions regarding condition.    Seller blocked me.   I asked why.  Seller replied that I asked too many questions and might be a "problem" later.   

If I receive a low offer I either ignore it or reply with a HIGHER price.    Generally low offers don't bother me and I do t take it personally.   I also make low offers from time to time, but when I do so I can back upy offer with data concerning recent sales, known
problems or issues with the unit etc.   I have been successful in getting sellers to understand that my assessment of value is correct.  

I sell mostly on EBay and always add 13-15% to my BIN price.    Buyers pay my fees but only see one all-in price.