Landing Page Limited Offer

Hello,

I am in the midst of launching my store and wanted to have a limited voucher offer on the landing page. If I say only 100 voucher available, do I only have to give away 100, or is this a tactic that is use to get people to opt in.

Thanks for the help.

You can give as many as you'd like since you're the only one who would know how many vouchers are left.
The only important thing is that people that opt-in actually get a voucher.