Because ready made goosenecks are already out there
Why not invent something new?
Yes know there out there Dave.
The 10 inch Gardiner in the picture works well.
However this was not about inventing a different gooseneck.
It was to make something that works just a well.
But at a fraction of the cost.
If you are not into DIY things then it is better to then buy one.
But suppose each to his/her own.