Nik Peachey recently wrote an interesting and informative blog post on how you might go about selling your ELT materials online using something called Tagito. Basically, it's a facility that allows you to promote and sell individual downloads.
Learning about Tagito is interesting enough - and worth checking out - but I've also posted a fairly detailed response in the blog thread there about how I operate English Raven's pay-for materials: essentially, through a general subscription membership that allows people to access whatever they want from the site over a period of one year.
I've since checked back and seen some more interesting comments from other netizens, related to why they are or aren't willing to pay for online materials, or else explaining other options for selling material online. Something that caught my eye was the option of self-publishing using Lulu (looks great, but could be expensive if you're located outside the US).
It's an interesting discussion for any budding ELT materials writers out there wondering how they can generate a little extra coin for their hard work and creative efforts!
:-)
