Again, one good reason is DLI. Photos can't take a 20-24 hour day, which means lights running at half the wattage to get the same amount of photons down on the canopy.
Autos can be grown with like 60W of LED a plant and still hit 3-4oz per in 60-80 days. That's completely nuts. With a photo strain that's like 4+ months of growing without a perpetual setup. By the times clones root, grow, and flip that same 3-4 oz plant needs another month or two, and a bigger, hotter, more expensive light to do it.
Another (huge!) advantage is outdoors, where I am currently growing a couple plants on my back porch. I can do that year round where I live. It's not always the maximum amount of light or the biggest yield but again, done in 8-10 weeks, at least an oz or two per plant, and nothing but the cost of the seeds. And you can make those yourself really easily.
I think autos are the future for home growers. It's just too much fun popping a few different strains, using relatively small lights, or a back porch, and 70 days later hanging stuff up to dry.