I think it depends on the individual situation/app. There are plenty who have startups on the side. That said, if your app is more heavily demanding user inte

I think it depends on the individual situation/app. There are plenty who have startups on the side. That said, if your app is more heavily demanding user interaction/complicated then I think you are much more likely to find that customer service demands and/or technical issues post launch will exceed your part time availability. An MVP tends to be just a small part of your vision. You test it out with some users and gather their feedback before progressing farther. If you cannot respond to them quickly I believe you will quickly find you have no users at all (good idea or not).