We all have different capabilities, goals, etc. I personally couldn't get anywhere near 6 grand a month. I am the wrong side of 50, OCD-ish, therefore too slow to catch a cold, and am simply out to make a living, not a fortune. I work within my own personal limitations and can live with that.
However, Richie, if it can be done, and I am sure there are some guys out there who can, it doesn't really matter. What others can do, you may not be able to do, and vice versa.
If you want to go out and do it, then go for it. You won't know unless you try.
Best wishes,
John