Well, multiply it by 4 and you'll have the cost of services this person was trying to get for free. And 150$ is on the low end of pricing. It's like a lot of other industries, you get what you pay for. Some nail artists create actual art and it can be really pricey if you're including products used and labor. It's just crazy this person thought they were going to get free manicures for 4 people with the length and design shown, not to mention a nail appointment can take multiple hours depending on the design and length, the longer the nails, the more intricate the design, the Longer it will take. So not only would you be out a ton of materials and products, but also hours and hours of time.