I've been here, in Trivia Rounds, for two months and I did only 4 rounds by now. Each time, I first thought about a 'theme'
and then looked for 5 questions that could fit into that.
Just like you, I had to put aside some good questions because the possible answers were too few. I noticed that the number of players for each round is somewhere between 10 and 15, that's why I prefer to choose the questions which have at least 13-15 options.
If a question has only 8-10 answers and, let's say, 12 people are playing, then I think it's impossible for all
to have unique answers, and I am always thinking about giving everyone equal chances for a "10 points