Ok, maybe I should say "punctuated equilibrium" rather than "static". Nothing changes until triggers of cumulative player action occur. So there are no minute by minute changes to markets as pirates kill traders, only big changes due to community goals and weekly power play expansion. Market prices fluctuate a little around set levels, but those equilibrium levels don't change over time.
Why isn't the game as dynamic as advertised? Some people say because it is still in beta. The OP mentioned that people working on it were sacked. We know that the game uses peer to peer networking with out central servers to save money. It's not a big stretch to assume that FD decided not to do the advertised thing that everyone is asking for that would be really fun only because of money issues.
Hopefully they do get around to it as Sandro said.
I understand concerns, but to add such complexity and get there takes considerable effort and time. We can loop trough another 'game shouldn't be released, it's still beta' but then we would have to go trough online/MMO/hybrid games in general.
As long as Sandro and Michael keep us posted - and that's something they really should do more frequently - about developments of simulation, we should be good.