So to exclude some inactive members just to create one usergroup and to move those users there as it looks weird that some user who is not with us 2-3 years get some rewards today

And after this to recount ?
Or there is option "Only active users?" within admin CP, but where to set in VB after how many days someone is active or not...so many options I just lost myself there

After this says please do not recount!
After any of these changes we again need to wait some time that everything get sorted out with data?