I like this idea, no more rushing the lootbox and leaving, it forces you to stick around and patrol the streets while collecting the loot, and like JovankaB said, its better all around.
Scientists: blueprints, upgrades
Tribute could be gathered every 30 mins per npc.
I want to comment on this real quick. There are only 1 scientist available in the TC towns, residing in Broken Hills, meaning it would be the only blueprint town. Could easily be spread out to include mechanics(Den, Gecko), drugdealers(Den), doctors(Gecko, Redding, BH), technicians(Gecko, BH), mine personell(Redding, BH).
That way you could have a few sources of blueprints from each of the TC towns but Klamath and Modoc.
Could also specialize the different groups to give blueprints in their area of expertize, docs give medical blueprints, drugdealers give drug bp's, mine personell explosive bp's, techs ew related prints, mechanics deals in weapon blueprints.
Kind of worried market would get overflowed with blueprints though, so maybe restrict to 1 blueprint every 24 hrs from each town, meaning for example you hold BH, so you can pick 1 out of 4 guys to try and get *that* specific bp you want.