First of all you can upgrade the locations once every 10 minutes, or almost 3 times every 30, or 5 or so times every hour, so the anti-AFK script doesn't matter, as mentioned.
1 hour of being AFK? That's 120,000/hour with 2 locations, 40 minutes from starting? | 1,440,000/hour at level 24 after 4.7 hours of griding | 2,880,000/hour at level 48 after 8.7 hours of griding (counting the time needed to get to size 500/500).

It's just unfair for other players no matter what!
Delivery gives you $800 every minute using the best one. New players unknowingly think it's a fair job. Business is 1000/minute once you get to size 500, or over $500,000 (five hundred thousand) every MINUTE after 8 hours of being AFK (including coming back every 10 minutes to click "Expand" and moving your character once per hour). Or every 20 minutes, or whatever.

The AFK timer would have to be set to LESS than 10 minutes to balance out the grinding part of businesses, which still wouldn't have fixed the fact that it's BROKEN by giving us $1000/minute at level 1 (after less than an hour of clicking "Advertise").
Crane is said to have nerfed it but I don't believe it as he's never really nerfed it more than by changing the starting amount of money to 5000 which you know what? It only added about 20 minutes to the time we needed to get to 2 locations, not changing the amount of money we get once a minute (1k at level 1, 48k at level 48) OR even the amount we get from selling it.

And it's the ability to sell a business that breaks it. Even removing it would be risky for the community without extensive alpha-testing. Not even I know how much money can be earned from withdrawing money. It could be balanced, could be broken.

The safest bet is removing the business addon and not worrying about ever having our characters reset.
So far 2 of 3 resets have been caused by it. If it hasn't been for the broken stock market, the first of the resets would have had been done because of the businesses anyway.