Resale value is a massive part of this. Corporate buyers (fleet owners, hire car companies, and so on) don't want to deal with drivers complaining about a colo

Resale value is a massive part of this. Corporate buyers (fleet owners, hire car companies, and so on) don't want to deal with drivers complaining about a colour they don't like - in the UK giving certain colour cars to employees who support certain football teams is going to just cause pushback. Neutrals just make life a lot easier.