I don't necessarily put myself on Ban Island, but recently I've been purchasing some things (1 SLG, 1 bag charm, 1 bag and anticipating a Pochette Metis very very soon) so I think I may have to so I can slow down! It also helps that I live in a tiny old home with little closet space, so I have to be practical about what I can actually store.
I have to agree with other posters, what helps me most is staying away from tPF and Youtube videos/unboxings/etc. I actually find I'm not super influenced by posts specifically, like I won't see a reveal and immediately want that specific bag but it does inspire me to start looking again and I find my willpower isn't as strong when I do that. I get paid weekly so it makes it a lot easier to budget and save up, and what also helps me is that every pay I set aside some "fun money" so that in the event I see something I like, I can buy it without feeling guilty or blowing my savings. I haven't actually bought an LV bag since June 2010 because there has been nothing I truly have loved (well, that was in my price range) but coming here to look definitely inspires me to give into impulse a lot more.
I actually stopped buying many high-ticket items from about 2010-August 2015 because instead, I realized "wow for the price of that bag, I can go to Disney World!" (or elsewhere, but I'm a huge Disney fan). Saving for those goals really helped to also distract me from LV etc, because I would say "wow for that price, I would rather go to the place I love!" I would never take those experiences back, but when I was recently debating the PM, my friend said to think of it in terms of vacations. Yes, it may cost the same, but a vacation is short-lived and the purse can/will last ages, and I have traveled so much recently that maybe investing in a purse is good and I shouldn't feel guilty about buying it vs. travel since I really have traveled a lot lately.
Maybe if you start to budget some money here and there, before you know it it'll grow and you can buy something without feeling like you're jumping ship from Ban Island! It takes a lot of willpower but for me, I feel better when I wait it out and sleep on it because when I eventually do it whatever it is, it feels great vs. the guilty feeling I sometimes get when it was impulsive.