Tim Ferriss has been systematically quoted on Less Wrong.

Systematically? Or "there are a few ad hoc mentions here and there"? ;)

Regardless, he certainly does mention a few strategies that I think are worth considering a bit more rigorously. I particularly like the recent 4-Hour Body book.

How to make money to donate utilons and show you care is a persistent topic on Less Wrong.

Obnoxiously so. But whatever your goals, charitable support or otherwise money is one of the easiest forms of power to acquire. We can consider the acquisition of instrumental resources independently of how much we want to show of our self sacrifice. :)

No one here seems to either have tried, or accessed the feasibility of Tim Ferrissing life (for instance accessing by checking for people who tried without the obvious survivor bias displayed in Ferriss`s own website)

(I don't quite agree - but the point is not worth arguing about. Scepticism is always called for with respect to surprising claims.)

A probability 30% of earning $12.000 per month working for 10 hours per week after a build-up time of 4 months working 10 hours a day to get it started (having fun while figuring out how does capitalism work anyway) seems like a fair bet.

That sounds about right to me (Ferris or no). Assuming certain existing skills or aptitudes in relation to self-management, execution and persuasion. Perhaps the most difficult part is being the sort of person who can go ahead and throw themselves into the deep end and put that amount of focus into money making.