We had similar conversation few month ago. You was considering make the legacy Krillrolls smaller or less frequent
and use the saved chips for monthly or weekly krillrolls, if I remember correctly.    

If you decide to go with it, please try to keep the bar low. The idea is to make recreational players play more.
If the requirement to qualify for weekly freeroll will be to collect 500 krill for the week like I see someone suggest,
most players will not even try and you will end up with few regs beating each other.

I don't think that lottery like incentives (great hand reward,etc) make players play more.

As you said you have lots to consider. Not easy job.