why not to limit children to just school

my friend came up to me the other day and told me a killer business idea
my reaction naturally was 'yeah lets do it' but his response was he cant because he is still in school
which brings me to my point today is it because you are still in school that you cant do business?
in Kenya that is i know it is discouraged. but should it be?
seriously look at it this way:
your child is in school not the best performer but is good in business he/she comes to you with a business idea then you discourage them telling them to finish school first
by the time they finish school the idea is gone and they performed poorly
a parent prevented their child from becoming a possible millionaire just because their primitive minds think 'school' is more important
school is not going anywhere just remember it is your duty as a parent to guide you child nourish the inner entrepreneur in him/her it might just pay off.