Maybe i doing something wrong. But it looks imposibble me to reach 4 sat/ faucet, not even 40.

• a free roll costs "-0.0025%" towards next +5 level
• a lottery ticket costs "+0.0052%"

Assuming I always spend all free roll income (2 SATs, larger payouts are negligible) on the lottery (and never win, as the chances are tiny) and 10 rolls per day on average, the missing "88%" until the next +5 level would take: 88 / 0.0054 / 10 = ~4.5 years. Nice! 
I never considered freebitco.in as a source of income (but as a fun activity), but these calculations mean it is not worth spending time there at all.