My first iPhone app was feature complete in about 20 hours. I've since spent an additional 100 hours on better graphics, better design, performance enhancement

My first iPhone app was feature complete in about 20 hours. I've since spent an additional 100 hours on better graphics, better design, performance enhancements, and other polishing. I haven't added a single new feature yet after the initial 20 hours, but the app is obviously much MUCH better and easier to use.