Marvel Two-In-One. The title kinda says it all, doesn’t it? You buy this book, you’re getting two for the price of one. In this case, two super-heroes. On a smaller scale, it’s the logic that, in the 1940s, led National Comics and All-American Comics to create the Justice Society, or, later, DC Comics to create the Justice League. It’s like this: Some kid has only one dime, and doesn’t know if he wants to read The Flash or Green Lantern. Hey, kid, suppose you could get both for one thin dime? And a bunch of other characters besides? Wow! It’s like getting free super-heroes!
And of course, what you don’t say to the kid is that you hope he’ll get hooked on the “free” super-heroes, and, instead of one thin dime a week, start spending five or six dimes a week, so he can keep up with all those new characters he’s been introduced to. It’s the same principle by which drug dealers give away free crack. (I infer. Do drug-dealers give away free crack? I’ve never met a drug dealer. That I know of.)