Im sorry you are having such a rough time dealing with a few agents.
I think part of it is some fulltime agents are just burnt out. Statistically, the average agent will sell only a few houses a year. Seems like itd be an incentive to call back someone trying to make an offer, right? Not so. Maybe they could have been burned a few times by inexperienced investors whodidn't know how to actually close the deal (been there.) , maybe theyve dealt with a bunch of tire kickers who do in fact waste their time, the list is endless. Regardless I do agree: If you are going to be a professional, do it to the best of your abilities. If you dont care anymore, give it up. Simple.
When I was starting out (as a few of you know. Thank you for all the help guys!), I had one agent that I could almost never get to call me back. She handled quite a few REO listings, but I could never reach her nor could I get her to return my calls. One day I just dropped by the office and invited her out for coffee. We chatted for awhile and she got to understand what it was I was trying to do. Now I get calls and emails from her whenever something that fits my criteria comes up. Sometimes its the personal touch that makes the difference.