By Dawn Chmielewski and Lisa Richwine (Reuters) -Walt Disney Co said on Tuesday its marquee streaming service, Disney+, gained more subscribers than Wall Street had expected, but investment costs dragged quarterly earnings below analysts’ targets. Shares of Disney fell 9% to $90.84 in after-hours trading. Investors have increasingly focused on profits over streaming subscription numbers for media companies that are trying to attract online viewers. Disney is spending billions to build its streaming options and compete with Netflix Inc and others. Disney+ reported 164.2 million subscribers in t…