I love reading short fiction, you see. But I like to read on paper, and I have limited time for pleasure reading. This means that I don't want to buy a magazine or anthology and get a grab-bag of stories. Sure, they'd be good stories, but they wouldn't be the stories on my urgent "Oh yeah, I've gotta read that" list. In the end, I'd never get around to reading them, and the purchased items would clutter up my shelves for years.
But. Imagine that I could go to a web site and build my own customized anthology. I'd skim the listing of available stories and think, "I've always meant to read 'The Cold Equations'. Let's put that in my anthology. And James Maxey's 'To the East, a Bright Star'. I've always loved that one. And, ooh! Here's one by Lois McMaster Bujold. That goes in, too."
Then I'd click a couple of buttons to select cover art, pay a fee which includes royalties for all the authors whose stories I used, and the software would automatically generate a pdf of my book and send the order to a print-on-demand publisher. Two weeks later, my anthology arrives. One anthology that satisfies my entire Wannareadit list.
As a bonus, when my daughter gets old enough, I could compile her an anthology of unicorn stories. And my son could get a fistfull of rock-hard science fiction.
So, uh... who'd like to volunteer to organize it?