I'm selling some 'brand' furniture. Great condition, hardly used, selling for £80.
First email: "I can only afford £30. When can I collect?"
Second email: "I'd need to travel from X and this will cost me £25 in fuel so can I buy for £55?"
Uh, no.
I don't go to Tesco and tell them I'll buy my weekly shopping for 50p because that's all I've got and I had to drive 20 miles to get there.