New users tend to flock to distributions with easy to use installation programs, that is, to distributions with graphical installers. Some people will probably disagree with that statement, but most users feel more at home with a point-and-click interface, than with a terminal (console) program.

While it is true that not all distro developers have the resources to code their own graphical installer, or to code a good one, I do not think that it is always necessary to roll your own installer. So to those distro developers without the resources to code a new graphical installation program, my only advice is, find an existing one that you like, one that you can work with, and fork it.