For many people their time is of no value.
If they spend it commenting in online forums or watching reruns of Gilligan's Island or watching the talking hair in their favorite news tunnel, it accomplishes nothing.
So for those people it make sense to do something constructive and useful, even if the value of that useful thing is small.
Not that all leisure is pointless, but leisure is like food. Most Americans have access to too much.
So now I need to apply my own medicine!
I agree with everything you said. I laser engrave all my hive boxes. It's takes a lot of time and doesn't provide any functional value (maybe theft prevention). I like it though and it gets attention from potential customers.
The OP stated it was to save money. If that's the point of the exercise, then it doesn't hurt to see what the process looks like and consider whether it's worth the effort. Even for a leisure activity, it's costly to build hive boxes unless one already has the necessary equipment to do it right.
I've done it the easy way (few tools) and the right way (right tools). I'll never do either again

Inner covers, telescopic covers, and bottom boards are a different story.
Anyone interested in saving a buck on beekeeping equipment should find a local beekeeping conference to attend. The vendors are motivated to get the prices down. Last year a vendor at MSU was selling deep hive bodies for less than I could buy the lumber. They are very high quality too.