But you are really really just keeping up with your percentage of the total supply.

The airdrop is less of a payment and more a break-even gesture.  The project seems to be slowing incorporating more space and  allowing more interest as it  progresses.  I do not see it as even possibly a ponzi.  Even if the dev team were to sell out on April 20th, that is their right... everyone knows it up front.  There have been 0 promises of riches all along.