Selling parts and lack of manners.

When I was selling parts for my dad on a mustang forum I got about 10 emails saying I'm interested. I answered questions and never heard back. THATS rude, not selling to the first person with cash. I think what's going on here is that you have a lot of people that are afraid to pull the trigger and send out a message of interest on every thing they are literally interested in. The terms been watered down by window shoppers so when people seriously are interested in a part it is kicked to the curb in favor of the person with the cash in hand.
You may find it rude but it's a "product of the forum"...I know i will get ripped for using that term but that's exactly what it is.