Turns out these hobbies can earn you a pretty penny if you play your cards right.
For instance, "if you are particularly talented at video games, or you have a unique angle on gamer culture and you're confident in front of a webcam, there is money to be made in professional gaming," writes Jennifer Gueringer for Pounds to Pocket, a UK-based personal finance site.
"Even an old-school hobby such as baking can be profitable with a sprinkling of self-confidence and a pinch of self-taught business sense (tastiness of your cakes is also a major contributing factor)," she says. "The modern spin is that social networking and the power of tools such as Instagram put the marketing tools in your hands: and if you want to avoid the internet, farmer's markets and local cafés sourcing home-made food are as fashionable as ever."
Whatever you enjoy doing in your spare time, "don't rule out the possibility that your hobby could be a fun way to at least earn a little extra pocket money," writes Gueringer.
The following infographic from Pounds to Pocket shows how six common hobbies can be monetized:
