This is standard operating procedure in mainstream churches. The financial sheet was posted in the church so anyone could read it. They also had a financial committee open to all members. The problem was that lay people had no idea how to read a financial statement.
The WT would be transparent if all members demanded it. We are taught that we are not good enough to even review something.
A few years ago my wife and I attended a large non-denominational church, my wife directed and taught in their preschool. They had a "fair" where all the various ministries set up tables to show what they did. I spotted the church CFO sitting behind a table containing several copies of the most recent audited financial statements. Nobody was looking at the reports. I picked one up and the first thing I did was look at the auditors statement to see who had done the audit, it was a Big 6 firm. I then started reading the report. At that point the CFO says "your're an accountant, aren't you." I said yes, and he said he could tell because nobody else attempted to read the report.
That's too bad, because the fact that the financial statements are out there signals a higher degree of transparency. And learning how to read them isn't that hard. (If anybody wants to learn, PM me I used to teach non-accountant mangers how to do it, I think I still have my notes.)
The fact that the WTBS goes out of its way to hide this information leads me to believe there is stuff there they don't want any one to know about.