But honestly, a fragmented marketplace may well be easy to manipulate, but it is far easier to manipulate under a monopoly. The tactic for XMR appears to be stay at Poloniex and keep the sideways trading going to ensure market cap is high.
There is no such tactic. We've provided whatever assistance any exchange has ever asked for in integrating the coin. Some exchanges want to do the work, some don't. It is entirely up to them and is their business decision to make, not ours.
I don't think he's talking about the devs.
His gripe seems to be that it isn't on Cryptsy, although it is on Bittrex, Hitbtc, bter, and possible a few others.
The fact that trading is concentrated in one exchange is not remarkable at all. Rather, that is the normal and almost universal state for every coin, as I explained earlier (with data). In fact the trading is currently
less concentrated than most other top-20 coins.
If Cryptsy wants to add Monero to their exchange we will provide whatever guidance they need to do it, but frankly given that at least the four exchanges above have already done it, I can't believe that Cryptsy really needs much help.