Comment by toddmorey

Pricing is a part of it, sure, but the real reason I think is that Sketch was designed from the group up to be a tool for creating digital UI. Without the clutter and legacy of Adobe Illustrator / Photoshop, it was a breath of fresh air. Also, I think it has an important advantage of feeling like a native Mac app. I always feel like I’m firing up a virtual machine when I start Adobe products.