The fine for OOB is not only for evading the police, but also to promote safe and sensible driving in the server. The level is currently set so that someone using an OOB to evade a police chase gets a fine similar to that which they may have received.
However, consider the condition whereby you receive such a fine. It is as the result of a major accident which has rendered your car undrivable and/or in a position from where it cannot be easily recovered. The resultant costs of recovery and repair are therefore considered to be significant and so the charges that are made are quite small really.
In the first release of CLiS you were actually fined one half of the value of your car for an OOB, so something of the order of 50k for a GTR.
What is really needed is for people to drive within their own limits and to be nice to others and refund them when they are the cause of that player having an accident that results in them going OOB.