Cow spawner from me = 30k

With my calculations a spawner and a cow spawning egg should cost you 15250 Noobz (9000 for the spawner and 6250 for the spawning egg). You might need to rethink your prices Miner as if you sold him one then you would be scamming him.

Quote from Fatnoob:
"Scam is also a no no. Taking people's in-game currency by scamming is against the rules - especially if you're scamming a newbie. You Will be delt with appropriately if caught."
in the Server Rules post. This may have changed but I personally see this as scam.

Selling something for a high price is not spam in the least bit.  Scam would be like saying if you pay me 200 nz a magical dragon will come out and kill everyone.  That's scam because i obviously lied about the dragon but now you lost 200 nz.  Also miner is just trying to make a profit, selling it at the recommended price leaves not much profit, if the items are value like you said you would want to sell it higher.  That's what stores do, the value of an item you buy is lower than what you paid for it, but the store needs to make a profit.