How many SMS subscribers do I need before running a flash sale for my boutique?

Many boutique owners assume they need thousands of subscribers before SMS marketing is worthwhile, but the math tells a different story. With 200 subscribers and a 15 percent click-through rate, about 30 people will click your link. If 25 percent of those clickers convert at an average order value of $85, that's roughly seven to eight orders and about $600 in revenue from a send that costs around $4.

Small lists can actually outperform larger ones because the subscribers tend to have a stronger personal relationship with your store. When you text someone who has been in your shop a dozen times, she's far more likely to engage than a random follower. The key isn't list size — it's list quality.

Even in a pessimistic scenario where you cut every benchmark in half, you're still looking at roughly $300 on a $19 monthly investment, which is an exceptional return. Start with what you have and let each flash sale grow your list for the next one.