WIN Coin doesn't has any value at all, it also doesn't listed on any exchange because it's like free money to test windice. All WIN coin will be reset in every 24hours too
You don't need to wager or reached any rank to eligible the rain. But more you chat and play, the bigger chance you will get the rain.
Same as this bitsler has got its own token BSLR. In that separate wagering contest takes place. More we wager increase the chance of winning small amount on the contest.