What season had a winning profit of $15,000?
CREATE TABLE "table1_2311410_1" (
  "season" text,
  "episodes" real,
  "series_premiere" text,
  "series_finale" text,
  "winning_couple" text,
  "winning_profit_aud" text,
  "host_s" text,
  "judges" text
);
SELECT "season" FROM "table1_2311410_1" WHERE "winning_profit_aud"='$15,000';