I think you got the sakura taisen demo last week right ?
(or someone else used the same middleman as you
) [ and you lost this big lot of cds only yesterday ? ]
Yes, a lot of demo are really rare but don't cost a lot.
Yanoman demo is one that was discovered lately by Tatsujin (thanks to him) but there are others I discovered myself last year that nobody talked about as they is tiny to none interest on them, like J.B.Harold Blue Chicago Blues Auto Demo CD, Monster Slider Taikenban and The Hyper Golf ~Devil's Course~ Sample-ban.
One new demo not already on the site is the harukaze sentai v-force demo (i am waiting to get it shipped).
I only saw 1 (or 2 for monster slider demo disc) copy of these 4 over all the last 5-6 years. Same apply to other demo discs like the gaia breeder one. I had it on the database from the beginning but just managed to see it in "real" and bought it immediately.
I only put a 10/10 rarity scale on:
Voice World Yume Talk Sample (despite seeing another copy of it for sale 2-3 years ago)
Yanoman Jigsaw Puzzle Catalog Vol.1
The rarity scale is based on my own experience and may not reflect the real rarity of every demos according to the number of pressed discs. Some rarity scale must be a lilbit outdated, the monster slider demo for example must be more 7 or 8 than 9.