Those of you selling parts

I have had a lot of good buying experiences here. My only gripe is being told I'm 3rd or 4th in line after being the first one to respond in ad. Especially within 1 or 2 minutes. I always respond in ad then immediately send a PM. How else are we all to know who really has dibs? Whats the consensus, 1st shot goes to 1st PM sent/received or 1st response in ad? In the end, I guess you can sell to whoever you want. I just don't like being B.S.'d. I will say that its a bit more obvious than some sellers think when they put off returning your PM to shop around a better sale for themselves. I notice that the contents of my PM can have an affect on how fast I get a returned PM or what supposed position I'm in. I just remind myself that you can't get all the deals. I'm usually pissed for a day, then I'm over it. This site is pretty damn good relative to others in the buy/sell department.