I spend a lot of time in the D2 trading forums, and consistently, on all realms and cores, and without wishing to name and shame too greatly (you will excuse me as I must provide examples), I see this sort of thing every single day:

Dozens of users who, every day, within minutes, early bump their topics with 'up', 'cmon', or an indignant 'OMG NO ONE!?'. To remind or acquaint those not familiar, the bump rule in these forums is four
hours, and yet many will bump their topic in minutes. Worse still, they will get away with this action virtually every time. Even if one reports every early bump they see, these threads are very rarely closed, and action taken against a user for this is virtually unheard of. Take a look at the
thread in question. As you can see, several days after my report, the thread remains open. One might say that these threads are inactive, and would not need to be closed. If so,
kindly explain this, or worse,
something like this - all open at the time of this post. The vast majority of these early bumped threads remain open indefinitely, and the creator happily bumps the thread for days to come thereafter. Even if one is to report every single post in the thread - something I have attempted in the past, as an experiment - no moderator arrives, no action is taken. When PMing threads directly to moderators in bulk, we are told to use the report function, which seems to do little as evidenced.
Why is this important? The oft-repeated line here, that 'just because you cannot see action being taken, does not mean there is not action being taken' does not hold water. By breaking the site rules, a trader is able to gain an unfair trade advantage with more viewership, and as a result, disadvantages those who respect the rules by pushing their threads down faster. This
is a problem. My suggestion is simply to make the jobs of both moderators and traders easier, and to have an auto-lock system and or an automatic temporary suspension assignment system (lasting, say, 15 minutes, the same as flaming) for early bumping - that is, two back-to-back posts by the same user in under 4 hours. A system such as this should not be difficult to implement, and is not abusable as far as I can see. The auto-lock is to prevent the early bump being used to the trader's advantage, and the suspension is to then discourage PM trades which would come as a result (PM trades are considered unsafe by JSP among other things, and may facilitate or beget scamming). We already have a cooldown system for thread creation after a thread has been closed - this would work in tandem with it.
Certainly, my suggestion will not prevent fake offers as bumps from people
who are admittedly selling the same inventory of items together, or reposts of the same ISO
over and
over and
over and
over again so as to circumvent the early bump rule, but I hope with time myself and others can devise ways of combatting these trends also; it is a start, and a potential solution to a major problem at present in this forum. Thank you for reading, all constructive feedback is appreciated and will be responded to.