Honestly to me the issue is when people refuse to respond, but in daniel's defense I know he has had some personal family things etc from reading his posts, but still any response is better than none.
If your covered up and real life has you by the balls (sorry ladies), just say so.....most people will understand, things happen. For me I try and be up front with people that it might take a few days for me to ship things out as I personally can't get to the post office while they are open so I have to get things sorted by other means. And I also try and ask people how quickly they can ship when I buy/trade.
I'm so spoiled by Amazon by the 3rd day after I order anything from anywhere I get antsy
tl;dr: communication is very important