Done many deals with kparpart. Never had any issue. They have actually all went very well.
To me a quicksale means they need the money 'quick'. It is ultimately the sellers choice how long he/she wants to wait on a response. If someone took to long and the seller decides to move on, that is his/her choice to do so.
We have all had a situation where we do wait for someone to reply for a sale and they never respond.
I would not be upset about it. You took to long to pay so the seller so he moved on. I see nothing wrong with that.
Looking for a Randy Moss 8x10 Autograph PSA, UDA, JSA Photo of the picture in my Avatar or close to it