Awesome article khal.

I also think that the best approach is with a 20-30% of your paycheck every month/week.

I also like to think in fixed amounts.

In Spain the minimum wage is ~700-800€

I 'encourage' to try with something small like 25€ every week.

25€ = 1 'medium-priced' meal at a restaurant or a 'cheap party night'.

25*4 = 100€ month = ~15% of your monthly wage.

Everyone can afford that.

Not to mention that you can always recover your money (with profit or losses). You're not burning it.

Kudos to you :)