I remember when people in Cyprus complained about CBC (Cyprus Broadcasting Corporation). It used to produce content dissimilar to commercial channels, i.e. tour the country's regions and explore culture, food, archaeology, nature and other subjects mainstream people would not normally watch. As a consequence people working in those sectors were encouraged to produce good content which would otherwise not be produced, and ensured good talent/r&d came out of it. Then people complained that it's biased, we pay too much for licence fee etc. etc. So the licence fee moved to the electricity bills but was slightly reduced, so now everybody pays it and can't avoid it. On top of that, there's now ads on the TV channels due to the fee being reduced slightly. As a consequence a lot of the content is no longer produced, and because it can be influenced by commercial corporations, it is more open to being biased.
As someone who knows a lot of non-UK people, the BBC is respected worldwide, and is one of the best (if not the best) channel out there. They need to compete in terms of salaries, to attract some of the talent, so do not mind the high salaries. Otherwise viewing figures would drop and their money/viewing hours would probably be higher.