I really like how you worded "Where does the money come from" .. A few things...
- Comments share 1/2 their rewards with the poster (the post does not share rewards with comments)
- You can convert Steem to Steem Power (not Steem Dollars)
- You can convert Steem Power to Steem (not Steem Dollars) by withdrawing it in 104 equal payments (2 years)
Steem Dollars is 1/2 of your paycheck (power is the other half). You can keep them as dollars and use them.
Thanks JSC, will amend now