I just do easy ones so that I can help out groupmates with any difficult runs (for those that still need it). Sure it costs me 60 stam a week, but as long as people need help I dont mind spending a lil over a stamina pot this way.

If no one needed my help I wouldnt though, and save the stamina (unless of course the whole group is in the same boat and no one is capping the group activity bar for SA)