Did it for about 25 years, sold out about 10 years ago. 
Ins was around $2 per A. 
Had 2 claims against me in 25 years,
sprayed roughly 30,000 A. per year, by myself
I had GPS guidance 10 years(1992) before the Co-Ops/MFA did
Good $$ , I was $4.50 per A, now it's $7.00
I could avg 400 A per day, 700A was a good day.
Give a good "cash discount" to keep your receivables low, you can put $20K+ on the ground every day.