Back then there were a few, SmartRewards eligible addresses, so my initial SMART investment was 2000+ the first SmartRewards was I think 945 SMART then decreased now to 587 SMART last time.
I earned it by compounding the rewards and my initial investment, not moving it.
You can use this tool too to see how much you are getting when you start. Also you can display the eligible addresses. Just input the address and you will see how much SMART you are gonna get.
I tried adding my address and my 5000+ SMART will gain me 381 SMART the next payout.