Some suggestions that I would find very useful.
* Purge/Reset all user points. Even more valuable if this could be done on a scheduled basis to prevent point hording, and making it fair for new users. ie: Reset all points the first of every month.
* Points decay. Set a rate at which your points decay. An alternative to a reset. Have it so every X days, Y points are removed from user totals.
* Points cap. An alternative to the above. Put a cap on the points you can use.
A way to try and control the points economy? Very interesting suggestions. Poll Added, Topic Title Changed, Poll closes in 7 days