What is win-share market?
It is a keyword sharing tool that allows members to share their keywords as well as the profits generated from those keywords.Based on the explanation by Kooday,a member can participate in it from two side,the buyers and the owners side.
The Buyers side
As a buyer,you can share the profit from the keywords without the need of owning them(full purchasing).All you need to do is to search for the keywords and pay $0.25(using account balance).After paying,you will receive different amount of credits:

This will help members to climb up to Diamond membership faster with lower cost.You will also be given a keyword which cost thousands of dollars randomly by just paying this $0.25.
The Owners side
If you are the owner of the keywords that were win-shared,and has participated in this win-share market,you will receive $0.05 for every keyword shared.Plus,if your referrals participate too,you will also receive $0.05 for every shared keyword of theirs.You will also receive monthly win-share bonus too.However,you will need to subscribe to the win-share market place which cost you $33 per month.Without the subscription,the owners side benefits will not come to you.
Conclusion

Well,the win-share market had just started,so there might be a change to the above explanations.Kooday has cleary stated that this feature is a part of leaving beta phase.Once Kooday has implemented the new payout format,Kooday will be going for the official launch.