Allow us to use something like 50k agris to get an extra boss rush attempt in addition to the normal 5 we get each week.

Why can't we use Agris or something else to get "extra" runs at boss rushes each week?

How about allow us to do store previous weeks so that if we skip a week, we can do 10 the following week?  

Also 50k is too much.  28K is a better number, because it would allow 5 extra or double the boss rushes per week, we get 140,000 Agris per week, 140,000 divided into 5 parts is 28,000 agris.  More accurate is 14,000 agris and allow for 10 extra boss rushes per week.