First I will point out that the moderators of the site did not choose to close your question, it was closed by 5 fellow high reputation community members.
Without speaking for them, my take on the reason for this closure is that the fundamental problem that you faced as a software developer here is that you don't have the transparency of data to decide which project you should do next.
According to the FAQ under the list of questions that are explicitly off topic:
and it is not about ... what project you should do next,
The question to me reads that even if a case were to be made that it is not a general market research question and that it falls under legitimate business concerns facing software developers, that it is still offtopic because the core reason for question is that you want to figure out what project you should work on next.
As far as Market Research is considered, if it falls in the general domain then it is off topic.
How can I choose a good pair of noise cancelling earphones for programming?
The above question pertains the software developers certainly, however it could pertain equally well to web designers, drafters, authors, etc...
Your question applies as much to entrepreneurs or software sales people as it does to software developers, probably more so in the case of sales and marketing people. Market research questions would only be ontopic if the case can be proved that it is almost exclusively the domain of software development.
I hope this makes sense and that I captured the communities thoughts on this.