The highest so far has been 305.00 and is known as the 305PH. This week might set a new record for the most expensive Zoanthid.... Steve (a R2R member) was the buyer of the 305PH.
Same say its crazy and some say they are worth it. In my opinion, if you are a collector then rare and uncommon coral is what collecting is all about.
I like them, but I like a lot of other zoas more than these ones too, and my budget allows for them a lot more than these ones. My money's on 307 for the final sale price.