Hey Copperhead...
I think what some are missing is the fun of doing it yourself because it is part of the hobby!
Many times it isn't just to save money!
Some will build their own to save money, others are just cheap.

Everyone has their own reasons for the equipment they use or build and contrary to what some think...
many people know it may not be as good as "store bought"... but part of the fun is making it yourself!
I don't worry about the cost... or the time it takes to build it... and just about every time the price ends up being twice the price of a ready-made one! But designing and building equipment to use in one of my hobbies brings me a lot of happiness...
and that's the name of the game!
Sometimes I believe some of the "negativity" is coming from people that don't have the ability to build it themselves?
So, they make excuses why it's not a good idea, because of skill, needing the high priced machines, or the cost and time!
So... I'd start with 1/2" holes in your scoop. You can always drill bigger, if you think it needs it after a beach run.
-Wayne