No. The coupon feature available in the Grand-Opening Email tool can help you format a printable coupon in your announcement emails, but you should use the coupon only if it makes sense for your business.
Coupons are a great way to encourage visitors to try your products or services. Even a slight discount or small bonus gift can create positive feelings about your business and provide that extra nudge potential customers may need to give your products or services a try. You don't even need a storefront to use coupons: You could instead simply ask customers to "mention this coupon" when they make an appointment or order, or reference a coupon number or other code.
If you decide to try the coupon (just click Show coupon when you're editing your email), be sure to describe the discount or bonus, the expiration date, and any special terms, such as one-time use.