Simply because EstiBot considers win, lottery and win lottery as keywords that could be worth up to X.
I must agree with @barman on this one... It must be understood that this is an automated appraisal made in a few seconds by an algorithm-based bot. WinLottery.org makes no sense to me considering that the TLD is originally intended for use by non-profit organizations.
Non-profit organization = not money hungry Winning the lottery = money everywhere
Try to get contact details from G o o g l e etc of as many Lottery site owners and try to sell it to them.
Even try to find lotteries that are offline, contact them also.
See how it goes..