What the hell is wrong with Craigslist People

I'm pretty much a "seller" on my local Craigslist, but in the infrequent times that i want to buy something, i run into your problem also.
Same thing on ebay this week.
The guys heading says it's this, and then the description says something else.
So i send one e mail asking two questions, telling him how to correctly identify the part for me.
No answer, so i send one more asking if he really wants bids on the part at all.
Still no answer, so i will just move on, as something else always shows up, sooner or later.