My personal opinion is that you should know what you're selling. For example, I have some random Barbie stuff that I have no clue what it's worth...I can either sell it at a yard sale for $2/piece (or whatever) *or* I can take time and do my research to find out what it's worth (if anything). I think it all depends on whether I'd rather invest time and effort into researching something - oooor if I'd just be content with getting $2/piece (or $1/pony, etc.). If I can get a good deal because the seller didn't do research, I think that's a good break for me
Now, this doesn't ever happen to me, so it doesn't really matter I guess, lol!!! Apparently 99% of the people in our area think their ponies must be made of pure gold.
I agree, it's not hard to do a little research online nowadays for vintage stuff if you're a seller. However, when friends or acquaintances have offered me ponies, I offer them a fair price in return - they're not selling per se, they're offering them to me because they know I'm a collector.
Elf