LOS ANGELES (Reuters) - The group that paid a record $2.15 billion to buy the Los Angeles Dodgers baseball team expects to boost the return on their investment by creating value with stadium improvements, aggressive investment on talent and by exploring a regional sports network after a TV contract with Fox ends. "It's a lot of money, but if we do our jobs right ... the long-term point of view is that people will see that the value was there," said Mark Walter, the team's new chairman who is also chief executive officer of private equity firm Guggenheim Partners, at a news conference. ...