I think we should limit the number of times you can change corporations/associations in one game round. - I think 3 is reasonable.
There is a particular group of players on my primary server that have found a serious way to abuse game mechanics. They are all top players, with large resources at their disposal and every few days they disband the corporation and start a new one. This allows them to maintain cheap easy to acquire bonus prestige workers and other desirable workers at a much cheaper rate, because instead of bidding against the top largest corps, they are bidding against small, low prestige newbie associations without knowledge or cash. While they may not have a very high ranked Association, the individual players are gaining tens even hundreds of thousands more prestige than other more honest players in the top ranks.