I am pretty sure it's still the same since I stopped attending almost 10 years ago, but this is something to think about:
At the Kingdom Hall, there's an accounts report. They say they gathered in an exact amount of money for both local expenses and worldwide work and that it exactly went to these exact expenses and this amount was sent to Watchtower. Watchtower will acknowledge exact amounts in a letter. At all times, members can know what the finances are. A member can look on the information board for some of that information. An audit is done every 3 months (I believe) where some elder double checks the accounts servant. Money is always collected by two people (to keep them honest).
At the circuit level, the members hear these numbers, but it's a skewed report. They summarize "expenses" as just that- no idea where that money went. They announce a "deficit at this time" no matter what, before the program is over so that people will put more into the boxes. But the members do hear what the status of the funds were for the circuit before this assembly and know how much money was supposedly needed by Watchtower to put on this assembly. Granted, elders hear more of the details of gathered money and expenses. But even they don't know how Watchtower calculates the "per publisher" cost for assemblies, because it's not a true cost but rather an invented number to maximize profits and ensure that they can report the "deficit at this time." They have a vote on what to do with the surplus that they know will exist, and even though they don't stray from marching orders on what to do with it, they are aware of what that amount was and that it left the building. The elder who figures out how much money was taken in has someone double check his numbers.
So that's bad enough. But at least the numbers are said, and as difficult as it may be to figure out, a person COULD see where the money is coming and going if he took notes and compared them from one circuit assembly to the next.
But at the District Convention (now Regional Convention), the members never ever hear how much money was gathered and where it went. There is not even a skewed misleading report. We are told absolutely nothing. I am sure the bean counters have people behind them double checking, so someone knows how much came in. When those sisters bring their boxes into the accounting room, there's plenty of double checking and security. We can be sure all the boxes and all their contents get into that room. But other than the counters who combine the totals and people from "the branch," nobody is told how much was gathered and how it will be spent nor the cost of using the stadium or auditorium- not the members and not the elders. There isn't even an invented "per publisher" cost for the facility, and the actual cost for renting a place could easily be shared, but NO! There is no accounts report.