Prices go down as well as up. Buying shares or TOK can lose you money, and Genesis can end up small if there's little trading.
PvP is still there. Bots, arbitrage, early buyers with big positions and coordinated selling can all happen. half.family moves that fight into the premarket; it doesn't stop it.
Big sells move the price. What you get depends on the size of your sale, so selling a large position pays less per token than the last price on screen.
Anyone can launch anything. Names and tickers aren't unique, and a link in a market's description doesn't prove who made it.
There is no audit yet. The contracts are tested but haven't had an independent security review, so use test ETH only.
Some ETH stays in the market for good: Genesis from fees paid while nobody held shares, and small rounding leftovers. There is no admin withdrawal for it.