Looking at the market for editors is the wrong place to start as their users aren't necessarily going to be your users. The key questions you need to ask are:

Looking at the market for editors is the wrong place to start as their users aren't necessarily going to be your users. The key questions you need to ask are: 1) What's going to be your competitive advantage ? 2) How much are people going to be willing to pay for it ? (i.e. go and ask them) 3) How many of them are there and how can you get to them.