There are server birth versions of "blood" tho. they are 1 stone. the 2 that used to spawn in the mage camps cant be differentiated from the serverbirth versions, but this only applies to 2 pieces of the bloody pentagram serverbirth set (the first, and third tiles west of the northernmost tip of the star)
I have never seen a full pentagram set, but do own 2 of the server birth blood tiles from it. they are also 1 stone. here is one of them.
There are also server birth wall blood versions. Also 1 stone. slightly different graphic than the 5 stone spawning one. I think theres also a 1 stone server birth wall blood of the same graphic as spawning, but its not very desirable because there no graphical difference, just the weight. Same for server birth skull piles. after the lich deco spawning versions came out the server birth ones value greatly diminished because the difference is the weight. im not sure but think the server birth skull piles are 5 or 10 stones, while the spawning version is 2 stones.
anyway, server birth blood is extremely rare, but hopefully that explanation helps if you do ever come across any. I personally love the evil mage blood as deco, it was some of the first rares i bought when i started collecting. as for value, the prices were accurate. i was getting around 10m a set (5m each) last time i had them for sale, but it was also around halloween on an atlantic high profile vendor.