“Spoiler Alert” (Universal), based on Michael Ausiello’s poignant memoir, debuted in six theaters (San Francisco, along with New York and Los Angeles) and provided a spark for the specialized market. It took in $85,000 (per theater $14,110) — at the higher end for this season. That’s enough to justify the brief platform before it expands to a multi-hundred theater run this Friday. Among traditional specialized titles, we’re confronting a discomfiting reality: This once-vibrant adult audience isn’t showing up, but non-traditional releases are thriving.