No support.
If you want more of an accomplishment you can grind for 200m's with the lowered xp rate given after achieving level 99.
Alternatively, you can set other goals for yourself (pets, cash amount, fastest boss times, etc).
There is no reason to waste what little development time we do have have with this.
/edit
The only person that can say he needs more of a "challenge" for lower xp rates is Unknown
Fair Dues.
This mode would be the same xp rate all the way through to 200m.
Flumby.
Thank you all for the support so far. Very happy to see alot of you would appreciate this.