Selling onion leaf

Dear members,

I have planted onion before 3 months in one acre.
My onion leaves are around one and half feet long.
In our area onion leaves are very much in demad.
Can I sell onion leaves by cutting half of the leaves?
Will there be any harm to the plant and such for the onion bulb by doing this.
Please advice me.
Thanks in advance.

Siddhartha.