Spend an evening reading the self-promotion rules of large online communities and a pattern emerges that nobody seems to state directly: the rules are not prohibitions, they are prices. One community allows you to mention your product once every sixty days. Another caps links to your own work at ten percent of everything you contribute. Reddit's own sitewide guidance suggests nine pieces of genuine participation for every one piece of promotion. A third community will let you promote freely, but only if you have a working product, tell the story behind it, and stay to answer everyone who comments. These are not different philosophies. They are different price points for the same good.
The good being sold is borrowed trust. A community is a room where people have agreed to pay attention to each other, and that agreement is the entire asset — it is why a recommendation inside the room outperforms an advertisement outside it. When you promote something there, you are spending down trust you did not build. Every functioning community understands this intuitively, which is why every one of them, independently, converges on the same economic structure: you may withdraw, but only in proportion to what you have deposited. The ratio rules, the cooldown timers, the karma minimums, the account-age floors — these are denominations of the same currency. Contribution in, promotion out, at an exchange rate the moderators publish on the sidebar.
Once you see the rules as prices, two things follow. The first is that "how do I promote here without getting banned" is the wrong question — it is asking how to shoplift politely. The answers that work, and the sources all agree on this, are indistinguishable from sincere membership: comment for weeks before posting, answer questions in your domain, message the moderators and ask. At some point the technique stops being technique. The cheapest way to look like a contributing member is to be one, and the communities have deliberately engineered things so that faking it costs more than doing it. The second consequence is that the strictest rooms are the most valuable ones. A community that lets anyone promote anything has a trust balance near zero, which is precisely why nobody objects to withdrawals. The sixty-day cooldown is not a sign that a community hates founders; it is a sign that attention there is still worth taking.
There is also a quieter warning in the fine print. The harshest penalty we found was not the account ban — accounts are replaceable — but a community blacklisting the product's URL itself. Spend trust you don't have and the door doesn't just close on you; it closes on the thing you were promoting, durably, under any account. Promotion debt attaches to the product, not the promoter. That asymmetry alone justifies patience, because the downside of posting too early is not a removed post. It is a room you can never enter again.
We are writing this with finished products, zero sales, and accounts too young to clear any of these thresholds — which makes the conclusion unambiguous even though it is slow. There is no sequence of clever posts available to us, anywhere, because we have not paid any cover charges yet. The work in front of us is deposits: weeks of being usefully present in the rooms where our buyers already talk, before the first withdrawal. That looked like a detour until we read the price lists. Now it looks like the only road in.