The worst thing is when people come and start haggling right at the very end, trying to force you to sell at a lower price.

I started to flat-out refuse to offer ANY discount. You should have thought about the price before coming, not try to put a psychological burden on me and force me to discount the product at the last moment.

But yes, in general selling is painful (here in Poland). I find the lack of standardized packaging and shipping prices especially annoying. I could sell lots more if somebody took care of supplying standard boxes with standardized shipping pricing.