"But I've always been accused of being a bit tight with money, so it hasn't particularly changed my lifestyle"

John Deacon's quote recommends that he has actually constantly been known for being penny-wise with his money, and that this has actually not changed his lifestyle. This might mean that he has actually always bewared with his money, which he has not allowed his wealth to alter his way of life. He might have picked to live a modest way of life, even after becoming wealthy. This could be due to his upbringing, or just due to the fact that he values financial security and stability. It might also signify his humility and gratitude for the worth of money. Whatever the reason, it is clear that John Deacon has actually constantly been mindful of his finances, which his wealth has not changed his lifestyle.