Lets look at a county like Machakos.
I think all ballast/kokoto in Nairobi comes from Machakos.There are about 60-80 ballast quarries in Machakos. would peg the number of tipper lorries Machakos sends to Nairobi at over 1000 trucks a day.
The cess fees for each truck is 3000/-.If you are governor and steal 200 truck cess,that's like 600k a day
If you include stone,sand health,mjengo,liquor fees...you hit between 1.5MN-2MN a day.
60MN a month-7-8BN in 10 years.
I think the other beneficiary is the MCA If you are in good books with govenor lots of cash.
No point of being MP or senator.