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haven't many already invested?

Sure, but I guess it is always easier to convince people to invest if they get something in return. The problem with this type of services is in my view that the benefit will go to everybody - which means that many will rather hope for others to step in...

we have a reward pool.. why not use it to finance something everyone needs..?
if we loose steem, we also loose the reward pool, anyway..

or the SPS?