When the SIM doesn't update for an extended period of time... OL's tend to become very formulaic. After hundreds of trials and errors, the best values are all known, and everybody is a fool not to use them. True, some inventive or contrary owners can sometimes do well despite not using cookies... but when the best performance per $ can be got from,say, Addie Joss, the smart money picks Addie Joss.
If the SIM were on the ball, or run well, or run at all, updates and tweeks to the the game would happen with a certain degree of frequency and regularity. Who knows how many owners have left the site over the last year or so due to becoming bored with the game? I rarely play OL's any more, as progs and themes still offer some variety... and having been here for some years, I never play an OL if the SIM hasn't been updated in more than 6-8 months.
Apparently, one day "soon", there will be an upgrade to the SIM. I've been holding my breath for a couple of months now.