Motorcycles are seen as a luxury toy by most. That's the big problem. The huge problem.
They're seen as danger by a lot of people. Usually that's the first thing someone tells me after i tell them i ride a motorcycle: "I know someone who crash/died/got maimed ..."
They're seen as not convenient for our weather.
Put these 3 together and you've got an inconvenient, dangerous luxury item when you're already broke with all your credit cards filled with travel expenses and dinners and no savings. And because you're still living at home, your mom doesn't want you to ride it and gives you **** for it and proceeds to threaten to kick you out or make you pay rent (because of course you're not paying anything while staying at parents and working full time).
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In my case, born late 80s in 1st gen immigrant family (in qc city), i was never exposed to motorcycles much. My dad rode in his youth but i only heard one vague story about how he almost got "lined" and had to drop it to avoid losing his head off his neck (gotta love Haiti).
Fast forward a few decades, in the very odd scenario when i started working downtown Toronto, i started considering getting a bike as my go-to and got my gear and course...also had a co-worker (now friend) kinda mentor me, and help me navigate through this new world. Wifey knew about it, but i didn't tell my family as they didn't need to worry about that, also I wasn't getting the bike yet. Even when i was ready to pull the trigger and had moved in with wifey, she got pregnant so i pushed the idea back. 2 years later i was getting my bike, as a 2nd car wasn't a viable solution cost wise, told my family on the very first day i had bought it. For me it's more of a utility tool; my commuter with a side of a toy to keep me happy, entertained and have that little adrenaline rush once in a while.
That's me, i'm in the millenial generation supposedly, the part of the generation (that grew up on commodores, atari, and 14.4k baud modems) who starts to have some kind of disposable income and who can spend money on things like motorcycles. But in my circle of friends, i see it, there's interest in it, but nobody pulls the trigger. You have the people trying to buy houses, or you have people still living with parents who won't 'let them' or people who just are so tight on money because #life or you also have the first wave of kids that were overprotected in childhood and see motorcycle as 'bad', that make up the significant others of said friends.... There are lots of factors coming in the way of adopting this expensive hobby/skill.
Not matter how good the marketing is, on top of what i listed above are more deterrent to getting one. The lack of status symbol around the bike [vs luxury car], the judgement from people around the bike [vs responsible non-hooligan driver], the increased danger due to decaying driver capabilities to even pay attention around the bike [vs fake sense of add SUV-safety]...
You gotta be hella confident to get one and rock it and have the right circumstances. Which isn't given to everyone