The whole marketing post was a bit TL;DR for me. How long have you been making $3K/month? How much time (man-hours) did you invest in developing the product an

The whole marketing post was a bit TL;DR for me. How long have you been making $3K/month? How much time (man-hours) did you invest in developing the product and were other costs involved? How much time/money does it currently cost to keep things running (e.g. updates, support, hosting)? A decent developer can easily make $100K/yr, which is quite a lot of months of making $3000