There have been exceptions Brubaker's CAPTAIN AMERICA , THE IMMORTAL HULK and Paul Dini's run on DETECTIVE.

Stay strong through high school. (8 titles a month)

Started to wane in while in college (4 titles a month)

Dropped off in the young professional years (2 titles a month)

Finally, I would only go to the comic store to follow some of my favorite legacy creators. (i.e. Byrne, Perez, Pini, etc.) Occasionally browsing something new that looked interesting.

I think it was both the industry changing (product offerings) but also me and my allocation of free time. (Job, family, everything else). I suspect the only thing now that would get me in the comic store would be a new offering from my legacy golden age creators. (Or a really strong recommendation from the members of thid fine establishment).

Man, that would be great!  Some of my favorite artists are still working, but most of my old school writers have moved on to novels, TV, or retirement.  If some smaller or new publisher would pull together people like Steve Englehart, David Michelinie (how many movies are based on his stuff?), Roger Stern, Don McGregor (is he still around?), Alan Brennert, maybe Gerry Conway, Chris Claremont, Roy Thomas, Roger McKenzie, Elliot S. Maggin, Paul Levitz, I would be right there!  Just give me some pre-British invasion writers who knew how to tell a whole story in 17-22 pages--people who don't hate super-heroes or comics themselves--and I would be happy!

That was also the nineties, so gimmick covers and Wizard magazine and crossovers all played a part, too. Zero Hour basically finished me off. After Crisis, Millennium, Armageddon 2001, The Death of Superman, and Knightfall, I couldn't take it any more.

When my mom was nice enough to be buying my comics I read them through early college around 1990. I was getting disinterested in most superhero stuff at that point and converting to Vertigo or even indie stuff like Joe Matt and Dan Clowes. 

Once I was on my own for purchases I cut down to just cool indie stuff and the occasional Vertigo.

The advent of trade paperbacks at the libraries kept me reading and expanded what I was reading. I went back to some superhero comics.

Currently I subscribe to Marvel Unlimited and just picked up DC's app for a bit. And I buy indie stuff, still, Clowes, Tomine, Chester Brown, Seth, etc. I also visit comic shops when traveling and usually pick something that staff there are recommending.

I don't really consider what I do "collecting" but I still read and still buy SOME stuff.

I've gone through different phases of "collecting" over the years, at different intervals, but I pretty much gave up buying comics on a regular monthly basis around 1993-94, for many of the "early 1990's" reasons mentioned already... too expensive, too many gimmicks, too many crossovers.  By late '94, I was in my first apartment and almost immediately went flat-broke.  By 1995, I was selling off my accumulated collection (maybe 1400+ at the time?) at local comic shops and flea markets.