Courtesy

I hear you OP.
Many people now days have so much stimulation driven into thier heads from so many places (mostly their smart phone with 1200 apps running), that they cannot keep a train of thought for more then a few minutes...let alone remember that they initiated asking you a question about something and you took the time to respond.
I got a member on here, has inquired about nearly every post I made in the for sale section..I take the time to reply asap and then crickets.
I dont know what his angle is, why ask if your have no intention of following up, with even a "thanks no thanks." I wont respond to him any further, its a waste of MY time.