Took the plunge and launched the service to convert designs in Adobe XD, PSD, PNG, JPG, Drawings on napkins etc into mobile app at a pre-approved fixed price based on number of screens, everything protected by a non-disclosure agreement.
Had to use my 20+ years of experience of development to come up with a reasonably accurate estimate for each screen.
Somethings that I learnt with the launch:
Although the "product" right now is just a single page website at https://design2ionic.com but launching this single page website involves a lot of additional things that I had not anticipated when I came up with the idea.
Some of the things that I had to do before launch was: