Most things aren't worth anything in USD unless they are ETS items or stamps/BD weapons. My advice is sell it onsite for NP and sell the np or convert the np to ETS items.
Those petpets are all buyable, with the possible exception of Droolik. I'm not 100% sure on it's price, but if anything, it's worth around 100k-ish. You're not even looking at 1mil there between them all put together. Just sell em off onsite and convert whatever you get from that into ETS or sell the pure.