The Blocknet Foundation keeps the coins to fund development. There will be no dumping of coins. They will be paid to developers in little amounts over the duration of the project. Therefore the ITO won`t decrease the value of participating coins. It will increase actual usage of a coins and should increase its value.
Remember though , when you are buying BlockNet shares with FIBRE, that the main profit in the future will be coming from FIBRE and its services hosted by BlockNet! so don`t spend too much on it
There is a lot more good info in BlockNet FAQ https://bitcointalksearch.org/topic/m.9269808