Son, at some point in your life, you will realize that no matter how good or logical your suggestions and worries are, or how good and honest your intentions, they won’t have any impact unless you prepare the ground for them with some noise 
And also, Son, at some point in your life, you will realize that it almost always is a good idea to go to bed 15mins earlier 
In that spirit: I decided to publish a terrain pack, similar content as the other two in thread, for $10. A good and honest price!
Here is one that I did a few months ago. Not perfect, but I only play with UE4 in the spare time of my spare time. 50 of them for $10, incl. world machine files and full UE4 settings will be a fair price.