When I was an early teenager I realized with an epiphany that I could take my paper route money, go to the grocery store, and buy my own cookies! It was a light bulb moment. No mom to tell me how many I could have. An entire box of cookies all to myself! So I did it, and I ate half a box of Oreo cookies, and drank 2 cherry Cokes. I got so sick that I threw up and had to go to bed several hours early. At that point I realized that my mom wasn't just being mean when she told me "no" and put limits on me, and I started listening to her more. Of course a couple of years later my real teenage years started, and I completely forgot that valuable lesson.
I was raised poor so even now that I can afford it, I feel something forbidding me from buying cake. That and knowing that I gain weight very easily and it takes me lots of hours to get raid of it.
I remember realizing this at about 20, and that if I bought my own cake ingredients I could make cake for startlingly little money. The most expensive part was probably the ready made frosting.
Anyway I started making cakes for friends and neighbours in my apartment building after work. I didn't keep it up for very long, maybe a year, but I'm convinced my reputation is still riding high, decades later, from the goodwill I sowed during that time.
You can, you absolutely can. The thing is now it's not just that cake at the bakery counter in the grocery store. You're going to commit to buying a 10,000 calorie pile of wonder. You need to make sure that you do a good job. You need to go find the best goddamn cake in your area. But then, that means you got to drive a little bit. And it's going to be expensive, and you already a couple of pounds heavier than you should be because you're out of time and dealing with the kids. Ah crap, the kids they're going to want some cake. I have to eat this in my car. Do you think the bakery has utensils? Damn now I'm going to have to go two places. Ahh screw it maybe the next time this is posted.
I discovered that in my mid-20s. I enjoyed eating a whole cake all by myself whenever the hell I wanted a few times and then the consequences begin to show and that's how we learn our lessons about things like that and then we eventually teach our kids the right way to do things and then they get bored with that and they turn around and rebel and then they learn their lessons in their 20s and the cycle continues.
As an adult you should realize that eating a cake any time you want is unhealthy and should have the self control to delay that gratification. Sure noone can stop you, but you should have the self respect to stop yourself.