~snip~
Maybe for small withdrawals the withdrawal is faster than big withdrawals so it is done manually, is there really no automatic system for big withdrawals? So you have to wait for the active team to do the withdrawal, isn't that hard work?
Financial admin can process all withdrawal quickly if he wants, but bookmakers team and support need to check few things while it's about big wins. Cause many people try to cheat with the betting system. For this support need to check big winning bets individually. And when a new user place big bet and wins, it requires more investigation about the user and bet. So it's not about the active team, this whole process need extra time. Small bet and withdrawal also goes through this type of long investigation if there is any suspicious activity.
Don't think it's a problem that all payouts are done manually. They can indeed choose to have everything done automatically, but that will have to do with their risk analysis that they deliberately do not. If certain odds are not correct and people put a lot of effort into it, you log in as the admin the next day and your bank account of your wallet is suddenly empty. They will want to prevent that. As long as payments are made within a reasonable time, everything is fine. I also cannot name casinos or other gambling sites that have automatically tuned it.