Ha! Yes, all those years I spent studying accounting and all the subsequent years I've spent working in audit and assurance has really left me with no clue on how it all works. I'm devastated you and your expertise didn't join earlier as I would have nominated you as my mentor!
I'm not clear on what you're trying to get at here because tbh you're not making any sense. When the voting lines close there isn't some poor sod sitting in a control room going 'fuck this I'm not counting all these votes I'll just count one of the HMs votes and say they're the winner'. Nope, sorry. Here's how it works.
Salmat Digital is engaged as the voting service provider for BB (and many other programmes such as The X Factor, The Voice, The Block). Salmat manages all three voting streams - phone, SMS and Facebook - their systems record, validate and count all votes submitted. Salmat's systems are continually tested in accordance with their internal compliance programme through the use of quality audits specifically designed to identify any possible - or actual - faults, shortcomings, and/or fraudulent activities. The robustness and effectiveness of their internal compliance programme as well as the actual voting system itself are independently tested and verified by Ernst & Young who carry out their own audit and assurance activities in order to prepare reports for Salmat which they ensure are reviewed and implemented. E&Y's processes are in turn compliant with best-practice (as is expected of one of the Big Four) as well as standards issued by various statutory and professional bodies.
Are you talking about adjudicators? Because if you are you may be partially correct. I'm not 100% certain whether an independent adjudicator from E&Y is present to witness and verify the counting of votes for each eviction. I would hope so as that's best practice but at a minimum I'd say they're there for the finale, but you'd have to confirm that with Salmat.
I'm confident though that your whole issue isn't really about the auditing of votes but rather it's about the influencing of votes by revealing the percentages prior to the close of voting. Which is an entirely different conversation and has absolutely no impact on the validity of the count. The reality is that the system to record and count votes is fair and impartial and the presence of an adjudicator, whilst encouraged, is not essential as the system itself has already been tested and verified at various different levels by various different and independent parties. But by all means continue to disregard these layers-upon-layers of checks and balances and believe Salmat or E&Y would risk their very business to rig a Big Brother eviction, after all it's your right to wear a tinfoil hat.