I need your opinion (Patreon)

Hi guys, I want to hear your opinions. Lately I've been thinking about charging patrons up front. As of now patrons are charged on the 1st of every month, and the past few months there are people who pledge and then back out before the time comes when they have to pay the pledge, by doing this they could grab all my contents then back out for free.

So I've been thinking about charging up front but I'm not really sure, there are pros and cons pro being what I said above and con, well, this could turn people off. If they pledge at the end of the month I guess they wouldn't want to be charged again the next week or so and so. So i'm conflicted on what I should do and want to hear some opinions. You don't have to comment if you don't want to but please vote on this. 

If you guys want me to charge up front, I'll change it at the beginning of next month though, so don't worry new patrons.