I had an idea to include an excerpt from another author's comedy in the back of Sir Edric's Temple, and have that reciprocated, but unfortunately that didn't come off.
I do think that sort of thing is worth a crack, provided the books/series involved have a good deal of overlap (one suspects a politically correct comedy would not be a good fit for my stuff).
With a trilogy it could be even better. For example, book 1 (of mine) could have an excerpt from author A's first trilogy entry in the back, book 2 one from author B, and book 3 one from author C. And A, B and C could reciprocate, so each of four authors gets a plug from three others.
I do think that sort of thing is worth a crack, provided the books/series involved have a good deal of overlap (one suspects a politically correct comedy would not be a good fit for my stuff).
With a trilogy it could be even better. For example, book 1 (of mine) could have an excerpt from author A's first trilogy entry in the back, book 2 one from author B, and book 3 one from author C. And A, B and C could reciprocate, so each of four authors gets a plug from three others.