I've realized that I've spent 500 points (equivalent to $100) three times to promote projects that could potentially earn $1000 or Npt. 

I'm concerned that this might affect my allocation of $SOCIAL tokens. Could someone please clarify the impact of this action?

I guess some people aren't aware of this 
I just spent 500 point and boom my allocation reduced drastically by 110 $SOCIAL

And I thought posting super post will increase earning potential

You have to read phairdrop.com for this. For Each 1000 Phaver Points you get: 200 points. Calculation is simple