"Spend $50, get $10 off" style promotions are one of the most common offer structures in retail. Minimum-spend thresholds are designed with a specific purpose in mind, and understanding that purpose can help shoppers decide when reaching the threshold genuinely makes sense versus when it simply encourages unnecessary spending.
A minimum-spend offer is built to increase the average order value. Rather than giving every customer a flat discount regardless of purchase size, the retailer offers a reward only to those willing to spend more, which increases overall revenue even after accounting for the discount given. For the retailer, the calculation is simple: if enough customers add extra items to reach the threshold, the total revenue gain outweighs the cost of the discount.
If reaching a minimum spend means buying something you don't need purely to unlock a discount, the promotion has effectively increased your total spending rather than reduced it. A discount on an unnecessary purchase is still an unnecessary purchase. The healthiest way to approach these offers is to treat the minimum spend as a bonus that applies only when it aligns with a purchase you were already planning, rather than a goal to chase for its own sake.