I can bake a cake, so I did my kids' birthday cakes until the time ds was at a friend's house and they found a book of cakes and he set his heart on a fabulous castle with fondant walls.
Way out of my skillset. Luckily two cake makers live nearby and did brilliant jobs on that and a few future cakes for now £60.
Until one year family stuff meant I didn't contact cake makers in time and they were booked up. One offered to do her basic kids sponge and buttercream for £25 but I assured her I could do that myself and not waste her time.
So I figured I had a day off and embarked on the cake, cutting pieces to shape, icing, then using fondant for the first time. It took me an entire day plus a couple hours the previous day to bake the cake. Eventually it did look great (people said wow, did X have time to make your cake after all?), but making little things out of fondant by hand takes forever!
A professional might have been a bit quicker but would have had to figure out the design in terms of pans and cutting, and charge for that. Given cleaners are paid £12 an hour, a baker is no less skilled!
I've been able to do cakes myself since thanks to buying printed icing pictures on Ebay and ability to buy various colours of Minecraft fondant squares, individual colours of hundreds and thousands, etc.
My dad enjoyed cake decorating when I was a kid and I remember the time we wanted to do water in a pool so got me to remove all the red and orange from a huge bowl of hundreds and thousands... I certainly felt that deserved wages!