It was only ever illegal to keep people like me from getting their hands on flint/gravel, and setting spawn on fire every chance they get. It was bad enough with fire charges. With the new update to WG, this is no longe and issue, hence flint and gravel are now legal.
Yeah, they're about the same How can I put a price on an item that is one of a kind? >_> If you want me to just make up a reasonable number, then so be it. However, for the time being there is only one--yours. More will probably enter the economy in the future.
You don't have Silked Villager Spawner's and now you should add Flint, Flint & Steel and Gravel because they are legal now and how did you get screenies of all those heads?
I have every head save for Cyp/Jeffciv. Roblox showed me Jeffciv, and I just found a pic of a cyp head on the forums (and I do have silked villager spawners .-.)