Well, that was fun
You probably need to ask WotC. We're not privy to the company's finances or sales figures.Can you link to or explain why a print version of Dragon Magazine isn't possible? Because I have near my desk a copy of White Dwarf and I'm wondering why WotC can't do it if GW can at $9 an issue.
Every article I've read on the topic of print media says that general interest magazines are losing subscribers and advertising but niche magazines (which is what Dragon Magazine would be) are doing very well. It's still a $22.9 billion industry.