It cost them practically nothing. A few settings change/2 lines of code & that's it. The reason they allow it is similar to how "under the table" txns are considered in most govt offices where everyone knows about it but never talk about it openly. The day when everyone starts talking about it is the day anti corruption bureau raids the office but until then everything works fine. Such "features" help some top mgmt ppl make their presentation slides regarding savings acc statistics look good & that's why they are allowed to continue as long as they don't attract too much attention.