So, let's take a trip down memory lane, shall we? Specifically, to the initial releases of Riven Mods, Vauban Prime, and other such things. Then, let's take a look at some of the discrepancies I've noticed over time when it comes to resource costs on research and build costs and how DE has responded to community concerns.
And for everyone who doesn't have the attention span or time to read through this wall of text, the main idea/ TLDR of this whole post is basically addressed at point #4,