I think there's a clash between lifehacker/Tim Ferriss and '[wanting] to share the results, maybe even give back to the "productivity community"', rather than an affinity as you seem to suggest. The former are profit-generating enterprises whose business is selling productivity techniques. Lifehacker is fairly authentic, but a Gawker-owned for-profit nonetheless while I don't personally place Tim Ferriss far from Tony Robbins et al. Whether that's overly harsh or not, I don't think either are comparable to independent folk posting their productivity systems on their personal blogs when their businesses are not related to selling books of those techniques, or making money from ad revenue their productivity tips attract.
I'm cynical, but '[wanting] to share the results, maybe even give back to the "productivity community"' doesn't seem like a complete answer to me. And I'm not trying to get anyone to admit secret motives, I just think there are subconscious things going on when people post their productivity solutions, and I'm trying hard to figure out what they are.