Just keep in mind that ASL is only one of MMP's licensed products. While I'm sure they want to create and maintain a good ASL line, they also have the license to produce quite a few other lines under the Avalon Hill and Gamers labels. Good business practice demands that you print new material, rather than reprint old. Assuming they have 8,000 customers who play ASL exclusively, they will sell 8,000 copies of Journal #17, but only 2,000 copies of Journal #3. And dollars spent on #3 might reduce total sales of #17.
POD requires a higher unit pricing too. MMP usually gives you more for your money because they are able to sell larger press runs. If they start doing short order press runs at higher unit prices they will be competing with themselves.