By , (Reuters) - Shares of Unity Software Inc soared in their debut on the New York Stock Exchange on Friday, giving the gaming platform a market value of around $18 billion and signaling sustained demand for new stocks.The Silicon Valley startup’s stock, which debuted on the New York Stock Exchange at $75 per share, closed at $68.35, well above the $52 per share in its initial public offering on Thursday.“Going public is good for discipline. We can also compensate our employees with more transparency,” said Unity Chief Executive John Riccitiello. “We picked the date earlier this year, and...…By , (Reuters) - Shares of Unity Software Inc soared in their debut on the New York Stock Exchange on Friday, giving the gaming platform a market value of around $18 billion and signaling sustained demand for new stocks.The Silicon Valley startup’s stock, which debuted on the New York Stock Exchange at $75 per share, closed at $68.35, well above the $52 per share in its initial public offering on Thursday.“Going public is good for discipline. We can also compensate our employees with more transparency,” said Unity Chief Executive John Riccitiello. “We picked the date earlier this year, and...WW…