I second everything quoted, but I'd have one inflatable bonus ($100?) in addition to the skill bonuses.
I want to say there were three inflatables, a "manager's choice", the monitors, AND the bread/coffee/candy thing on every sweep towards the end. Absolutely plausible that if you were the first out and could nick everything, you could win without shopping.
There what one episode where a runner managed to pile up $700 in bonus money but knocked over a bunch of stuff and the fines reduced that total by some amount.
The thing about the bonuses--at least for the coffee and candy--is that they're not shopping, they're watching a person standing there waiting. The Sweep Swipe had movement, and the Manager's Special could be frenetic as well. I agree that you want the inflatables and one or two bonuses (and sure, have a stack of them to rotate in and out) but not a whole bunch. On the other hand there were some very early episodes with just the mystery bonuses and totals between $500-$750, so I can see the desire to introduce more money into it.
As long as you have people running around and enjoying themselves, it doesn't matter how much the candy counter is worth or whether the mini-sweep pays $50, $150 or $222.22, having the fundamentals in place means that those little things will fall into place.