Calculating a 60m setup as 4 days of botting is just plain wrong. In order to get a correct number you need to look at how much more you make because of the equipment upgrades.
For instance: 1 hour of botting with a 5m equip (270-290 GF) would make you 550 - 575k. 1 hour of botting with a 60m equip would make you 750k. Now the first 500k would be money you would've made anyhow, the 175k extra on the other hand would be the money you make by upgrading your equipment. In other words for a 60m investment to turn a profit compared to a 5m investment, you would need to bot for 343 hours, over 14 days.
http://www.thebuddyforum.com/demonb...-simple-investment-calculator.html#post570594
Since it's relevant, I'm shamelessly going to post my calc here.