Hi @metzli, just saw this while replying to your comment about the TULIP game. I hope you realise that my MAPR fund (run at @accelerator) has been doing the same for the past 20 months! MAPR used to be just for delegators but was tokenised after Steem Engine started.

One important aspect is that one can now earn a high return without locking in SP; just buy the tokens and then sell them if and when you need the liquid STEEM. The spread on MAPR is quite narrow so it is always easy to sell.