While i respect any artist's choice of business model to censor their content in order to make a living from art it is is known to receive a lot of flak pretty much anywhere for leaving people out or "cockblocking" as some would prefer to call it. I think your choice to make them public after a set period of time is a good middle ground to address this problem. Some people will support you by pledging money and others like the members you find at e621 will help you by spreading the word.

Aside that there's also piracy issues that becomes less of a worry since it's gonna be posted free anyway.

I say try it. If it doesn't work you can always try something else later, there's no shortage of business models really and besides i like your art.

Please do try this

I love your art and want you to do well, so I’m putting my advice in here. I’ll let you decide how knowledgeable about the art market I am by reading.
As far as making it as an artist and yeah, profits goes, I gota give you a warning!
Keeping public interest positive is utterly critical and you will find strict pay sites will eat away people enjoyment from your art and dirty your image. People like to see ‘the art’, if they know something is hidden from them and they can’t see it without payment, they take it as personal insult (especially on sites that contain lots of free art). Both new and well established artists can take a serious hit from this kind of thing. People know artists want to make a profit from their work that’s ok, but people in the art business know this comes from taking commissions. And your commissions are fed directly by public interest, so yeah id step away from the pay to view attitude pretty fast.
What does work well is paying to see it early as spritersie suggested, then releasing it at a later date free and in full. Tease with the cover up pics, tell people it’s coming soon but then tell them how they can get a look in early ahead of the crowd! Adding sketch material you’d not normally upload onto your patroon will also help get customers, while not sounding like it’s something people will miss out on, they ‘just have to wait long enough’.

Though to be honest I find that site horrible and very unprofessional, I don’t like paying another company when I could be paying the artist directly. I’d much rather a personally made site, you just gota invest a little before you get pay back. Do I need to mention the bad attitude already associate with the place?

You’re a great artist and I hope you do well, but I would really reconsider while you still can. There are much better ways to increase profits.

I am already taking that advice however, I don't plan to shy away from patreon any time soon, and I still have the ambition to at least make minimum wage with the service some day.