Well, that's classifieds for yah. Some people are merely naïve, some are after $$ and clueless buyers, but some are actually quite conscientious, considerate, and well-meaning.
I continually advertise on CL and having been vising about a dozen of hobbyists a month on average over the last 7 years in upstate NY and in south FL. Vast majority of those folks are pleasant to deal with. Some even drive to my place for 2-4 hours to bring their beloved wet pet. That's, sadly, become an astonishing dedication that's pretty rare.
I do see all the time rather unreasonable ads. There is a good portion of people out there who want to make $$ or at least recoup 100% investment on their (used!) tank or outgrown pet that they either cannot take care of anymore or don't want anymore. Ads for a $120 gal tank for ~$300-$500 or for 2' RTC or 1'-2' silver aro for ~$200 pop up regularly.
One thing we can't blame them for is for trying
Natural selection, one thinks, will straighten out them and the buyers if they manage to find them
