Hold on a sec... that last Voltron show got 8 seasons? EIGHT? That number that sounds like the word ate?
They could have pulled production on it if it was losing money.... doesn't matter if you ordered an ass ton of eps up front. We only know the toys didn't sell.
If I had to guess I'd say the show probably broke even or made a tiny bit of money, which doesn't make it a flop like say... Kevin Costner's Waterworld was a flop.