As much as I cannot argue with Sungura's deductions and as much as I agree with his view,I'd still advise you to consider insurance. Don't look at it as enriching the Ndegwas etc because in all businesses you'll end up enriching someone anyway.
As much as an acre in Karen was 16k in the 70s not many of us bought. You'll find that there are so many loopholes for money that you put a side in an undisciplined,inconsistent manner that eventually you'll end up with less that you'd planned to have.
My suggestion is,get insurance for education,and use the rest of your disposable cash to invest. No need to gamble with your kids education money.

Bright and interesting people talk about ideas.
Those of average intelligence talk about things.
Stupid people talk about other people.