Before even taking club rivalries into consideration, local fans of Arsenal, Chelsea and any London team apart from Tottenham Hotspur have been urged to support West Ham United in their battle against Premier League relegation by the capital’s mayor Sir Sadiq Khan. As Khan pointed out, the taxpayers of the entire city stand to face a cumulative bill of an extra £2.5 million ($3.4 million) should West Ham get relegated due the added costs of their London Stadium hosting Championship fixtures. With two games of the campaign remaining, the Premier League relegation battle has boiled down to a two-way duel between Spurs and West Ham. While the cost of demotion for Tottenham could exceed $300 million for the club’s billionaire owners, a drop out of the division for the Hammers would hurt the pocket of regular Londoners, according to Khan.…