The reason: it is delicious, healthful, and very easy to make. The only prep is boiling the pasta, chopping up the grape tomatoes, olives, and basil, and... that's it! It only takes about 15 minutes from start to finish. With some parmesano reggiano on there, it only comes in at about 540 calories, too! The olives are salty, the tomatoes and basil sweet, and the cheese salty and creamy. It's a good combination! It even looks good enough that I took a photo of it-- very impressive for a 15 minute meal.