Okay the above is the approximate cost increase for Patreon. Please note that this is for each individual pledge. That means if you're giving Artist A $1 and Artist B $1 currently ($2 total). The artist gets about $.80 each from that (guessing based on how much Patreon takes from me, but not sure what it is exactly). Then after the 18th, you'll be paying $1.37 each ($2.74 total). And each artist gets $.95 from it.
Remember this is PER pledge.
I really think Patreon should total up how much you're pledging across the board and THEN assign the fee to it. But they don't do that, because they won't make as much money that way.
The problem with this setup here is that people are going to start picking and choosing which Creators to follow, keeping up with some, dropping others, and paying the same thing they pay now. This ends up with both Creator and Patrons losing out.
If you are against this change, PLEASE let Patreon know. If you have them on twitter, they have @Patreon and @PatreonSupport. I think you can contact them here on the site somewhere too (That doesn't show for me since I'm in the edit window).
I don't mind paying the fees if it means that people can still give a set amount to their artists. But Patreon is saying the following on their twitter:

Yeah, I don't buy that either. I feel like all the 'researching' they've done is talking with people that rake in A LOT of money and Patrons that have plenty to spare. I think this is going to hurt the little guys a lot, people that only have $1-2 a month they can spent on things like this. I've long supported people that can only pledge $1 and this kills it for them, especially if they're pledging to more than one Creator.
Edit: Again, this is per pledge according to their twitter support:

Silver Huskey
2017-12-07 18:16:42 +0000 UTCSimone Spinozzi
2017-12-07 07:22:31 +0000 UTC