Do a lot of people train for a while and then decide it's not for them?

Been training for 1 year and reflecting on my time so far. I noticed some of the regulars I trained with for 6+ months stopped showing up. Haven't seen them in months. Best guess is they decided it wasn't for them. Which is kinda ironic since they had nice gloves and shin guards instead of the generic cheap stuff coach gives us when we sign up. I figured people that drop $200+ on MT gear means they like it enough to see it as a long term hobby. Is this fairly common? People try it out for a few months or a few years then decide it's not for them?