The fact that you don't like it does not make it an exploit. An exploit is something that the normal player won't use, and that provides an UNFAIR advantage.
As an example, a classic exploit is the various methods of duplicating inventory items. This is not something that legitimate game play will provide, whereas the exploiter ends up with multiple copies of an otherwise difficult to acquire item.
The fact that the OP has a point about how the game proceeds should be addressed. If the game only plays well for the people that can invest large amounts of time, then one of two things will happen. You will lose a majority of the casual players or the game won't attract them in the first place as word gets around that the game is not worth the effort.
I didn't say that I had a problem with it. I was simply pointing out to the OP that it isn't a mechanic at all. If you don't want to define it as an exploit, then good for you. That still doesn't make it a mechanic.