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Paid subscription models should not be hard to come up with, if you want to use my dApp this is how much a month it will cost. SMT's were expected to bring a use-case in for companies/business/people that want to earn money. If the thought is that in order to post in a particular community or to read content in a particular community, or vote, then that I think would drive people away from those communities to others.
esample: Let's say freewrite community wants to charge a fee to view items on their community page, why would I go there when I can see similar if not the same content on the inkwell community page?

Right now a few dApps and their creators are struggling, example steemworld.org, I understand that, I like and use it every day, I know in todays market 1 steem is not a lot, but 1 steem a week I send to help in the cost of it, because I like it. If the price was to high I would find other ways and means of getting the information provided even though I like the layout of his pages.

So if thinking of out of the box options include extortion, (that is how I feel about the SPS) from the users then I think all the options should stay in the box.

!ENGAGE