Only comment/question regarding the time and cost of manually clearing chips.
How much is your labour time per hour? If you cost say $50.00 per hour and spend 2 hours cleaning 60 lbs of chips that's $100.00. At $7700.00 that's about 700 odd hours or about 6 months labour over a year - clearing chips.
Compare your labour time/effort for a manual tool change against an ATC.
Feel free to pick on my arithmetic and/or labour costs/efforts! :-)