Sure, the payoff is huge if you can charge royalties, but so is the risk. You don't want to be the one that spends tons of money to develop a new standard only to have someone else's design chosen. You're also limited in how much real-world testing you can do since you can't market devices with the new connector to the public until the law is changed. And if the government is going to mandate that everyone use a certain kind of port then it ought to be made available royalty-free, which removes the prospect of a huge payoff.