they shouldn't be posting those kinds of bets/events. even if she were gay, she would never announce (now of all times) right before her presidential run.
Anyone can host anything at betmoose - up to the bettors to decide what to bet on

. You're right it's kinda silly but still good for a laugh sometimes, I've seen a lot of funny bets get buried created that I would never bet on but are interesting to consider
I made a random one the other day as well:
https://www.betmoose.com/bet/which-will-happen-first-3541. Circle.com - offering bitcoin buying/storing/exchange/marketplace services (any of the above, they just need to actually launch something viable).
Last I heard that one was already met since Circle does accept Bitcoin
http://www.coindesk.com/bitfin-day-one-circle-talks-p2p-payments-isle-man-details-bitcoin-plans/The Circle CEO explained in his opening keynote speech that bitcoin is creating new standards for global consumer finance, but it still has a long way to go to cross the chasm and enter the mainstream.
Allaire explained that hes particularly interested in developments in person-to-person payment services that utilise digital currency, stating:
Person-to-person payments present a huge opportunity and I believe that, in five-to-10 years, sending money person-to-person will be as common as text messaging.
As for Half Life 3
If that ever happens I would say that would be a big bet in and of itself lol.