i guess it depends on your perspective.
I never view filling jars as a fun hobby. but games are a fun hobby. and if you do a job that makes you very bored and fed up of playing games you'd ruin a hobby. that is if you play a lot of games, it could potenitally ruin your gaming fun.
but that is only what i have heard. positions can entail different kinds of testing. and some positions may be very easy going and fun. i haven't heard of that but it's possible.