I wonder how many messages s/he got from various eBayers saying "Hey, I really like the vase you're selling - I don't know anything about it, but it's really nice. Would you be willing to do a buy it now for (insert nominal figure here), as it's my (insert spouse/parent)'s birthday/anniversary coming up soon and they collect this type of glass and I know they'd love it!"
I've had several along those lines for fully identified pieces in the past, so I pity sellers who don't genuinely know their onion.