Step 1.  Analyze game mechanics so determine what would drive people to such extremes to accumulate credits and experience.  
Step 2.  Upgrade all standard Skylines to premium.
Step 3.  Add 10 new Skylines, to keep people happy (what the hell PD - no Skyline GT-R, E-BNR32 '92 !?!)
Step 4.  People seem to like these 'Seasonal Events' - 25 new races(*1) 
Step 5.  Implement "Create Imaginary Friends" function so people who don't want to do the next exploit can have someone to play with.
Step 6.  Submit paperwork, detailing purpose and contents of update to Sony.
Step 7.  Paper word rejected, add 2 more premium Skylines (to keep Sony happy)
Step 8.  Re-submit paper work, detailing purpose and contents of update to Sony.
Step 9.  n=n+1
Step 10. if n<=5 then (Goto Step 7) , else (continue);
Step 11. Release patch update to community.
Step 12. Some jerk found a loophole with the imaginary friend function - Tsukuba Circuit is paying off 1,000,000 credits for a 15 minute race.  Goto Step 1.
(*1) skylines only