What
@bartosimpsonio said, does that topic bring in those sorts of numbers?
If not, is there something you can make in a month of effort to solve a big "problem" your niche has? Cause you don't need those kind of numbers to make money off of your readers.
Ex. If you create something worth $99 x 1000 people = 100k (minus 1k).
I feel that might be more achievable than aiming for 100k visitors. But that's just my opinion. I just feel too many get stuck on aiming for the giant numbers when if you get 20k visitors and 1000 buy something from you (or if you can find 100 profit affiliate) then you'd still earn nearly six figure or at least five figures.
Just depends on your goals. I think a lot of guys just want 100,000 traffic for brag rights really. There is more efficient ways to make income than getting 100,000 visitors.
But to answer your initial question, it's not bloody easy, otherwise we'd all do it.