I completely agree with you about the value of putting monthly amounts into Steem. Maybe not $100 for everybody, but at least some amount that each can afford.
I posted on Reddit a couple of years ago about buying $50 - $100 per month of bitcoin each month to dollar-cost-average into it and create gentle price support, and everybody laughed at me. "If you are sure the price is going up, why would you dollar cost average?"
But the thing is I was sure it would go up, but I had no idea when. The price was around 350 or so when I started and varied between 300 and 400 for a very long time, so I got an average price of $330 or so... for as long as I could afford $25 per week. Eventually I had to stop because my priorities shifted, but I didn't sell what I had already bought.
Well I think you know the ending, except I finally took profits way too soon (in February/March at $1400... oops) The rest I let ride, except some is funding my forays into other crypto-currencies like Steem.
I am doing basically the same thing with Steem now, except my online wallet was charging too much for withdrawals so I moved $700 all at once and will do more in a month or so.