It's a tool for presenting visual or audiovisual work to others (e.g., prospective clients) and is used by photographers, designers, sales reps, florists, and pretty much any other field where that presentation is a key part of the job. The customer-facing appearance can be completely customized to match a business's branding while leaving the management bits out of sight.
It started out life as a tool for our photography studio to present more recent work to prospective clients since it's incredibly expensive to keep the print equivalents up-to-date. The original price was $9.99, which was bumped up to $14.99 after a couple months if I remember right. The current $12.99 price is only a few months old and is a result of the market leveling out a bit. In its first year or so the revenue was $10-15k per month, but the saturation of the App Store and the introduction of new app possibilities that dilute the ratings (e.g., magazines) has lowered it to its current revenue. It definitely won't last forever, but I believe it will continue to be worth my time for a while yet.
It wouldn't hurt considering it would be free advertising. If I generated steady income off a popular app, I would be letting everybody and their momma know about that app. I would even throw a sales pitch right now!
