That's pretty much THE build. I soloed the whole game with that build. but it's also good with randoms because you can't really rely on them for anything in particular.I realized that my favourite build, which is a melee weapon with fast attacks and armour piercing and a ranged attack that can kill specials, is great because it's mostly self-reliant.
I started with $500,000 in Big Ambitions and got down to $27,000. That was when I finally started making decent money from my stores. I started over and am not creating duplicate businesses and want to have one of each. The coffee and pastries shop is the most difficult so far. Requires the most number of employees and has the lowest profit per item. I finally managed to get close to $2000/day profit from it.