What do you think of selling textbooks online? Is it a profitable online business?

Once in a while, my blogging pal and I will brainstorm and come up with niches that we can try for our blogging empire. The other day, my blogging pal suggested to sell textbooks online.

I won’t brush off this biz idea, but I need to do a bit of research first.

If there are other niches that can bring in more money, then I will go ahead with those profitable niches first.