Regarding those homage covers, perhaps the worse offense-

-C!

C!, you've shown the difference between a talented creator team, and a fourteen year old trying to a Marvel cover. And fourteen years might be too generous.

I would expect to see that comparison in an art class, to show the "Marvel method" vs an amateur's method... or maybe in the old "How to Draw Comics the Marvel Way" as a negative example.

Another example I saw a few years ago was of the two covers for Sentry #!. One seems to me to be editorially requested, "Draw a standing character, but draw him at an angle so he might look like he's flying. And make the pose as non-dynamic as possible." The other cover, #1B looked as if it were, "Draw me a flying super hero  - OH MY GOODNESS THAT'S PERFECT! SOMEONE MAKE A MODEL SHEET OF THIS DRAWING!"

I'll say it again. Nostalgic covers, poorly done, of characters that I do not recognize, aren't going to get me back. And nostalgia doesn't work on buyers who aren't nostalgic. 

It's not going to change Marvel. They're still on a non-stop express to crap town.