LOL! wel said. instead of looking for niche that don't pay well, should we not be looking for niches that pays well?
some of my sites are high pay but low traffic due to competition and some are low pay but high traffic due to less competition, so kinda balances out at the end of the day! i don't have any favorite niches, just make sites on good niche and most pay well
Or try and find a middle ground, not high nor low paying but one of the less mentioned niches that pay averagely.
Most of the niches are nowadays getting only lower returns and some of the worst performers are pet related, celebrity, health etc...