I like how they've been focusing (for the most part) on previously uncollected gaps. So, using Amazing Spider-Man as an example, most of the first mapped Epic Collection volumes have been covered by Omnis and MMWs, so they've been releasing latter volumes first.
I do get your point, though, and also doubt we will ever have a title with, say, 22 consecutive Epic Collections released. But, it's a format I really like so far.