Disclaimer, I make these comments with the best of intentions:
A Boom state is triggered by Wealth and it generates Wealth. This is an UNSTABLE condition. A system in BOOM will not come out of BOOM unless direct action is taken that not only counters the bonus to Wealth granted by BOOM, but also decreases wealth below the threshold that started BOOM.
This kind of instability is seen everywhere in the background simulation. Sub-Factions with high influence generate the lion's share of missions, which in turn generates more influence for that sub-faction... an unstable condition that keeps the sub-faction at the top at the expense of all the others. Another example is, factions with high influence own the stations. All commodities trading, exploration data selling produces influence for the station owner, which happens to be the faction with the highest influence. So again, the rich get richer.
This is all unstable and will always lead to the situation that exists right now: an unreasonable quantity of systems with one dominant sub faction, or in the case of states, a huge quantity of BOOM and CIVIL WARS. Note Civil Wars are often between two sub-factions with almost no influence at all, so whatever the threshold is, it is easy to trigger.