I don't see how you violated the fair play and sportsmanship...
What is expected of me in terms of fair play and sportsmanship?
Even though fantasy games are meant to be a competitive experience for all involved, it is important to us that our users not lose sight of the rules of fair play and good sportsmanship.
To this end, each Public League fantasy team owner (Custom Leagues are controlled solely by the League Commissioner) agrees that, by joining the game, they will abide by the following regulations:
1. All league-related transactions will be executed with the intent of improving the owner's team or its standing within the league.
2. No owner may drop or "dump" players from their team for any reason other than improving their own team or its standing within the league.
3. No owner will engage in any action that might be deemed to be collusive (two or more owners agreeing to make moves that benefit one team, but not the other).
4. No owner will make any roster moves (including waiver claims, trade proposals, etc.) whose sole purpose is to hamper the play of other owners.
5. No owner will take any action whose purpose is to, in any way, interfere with fair play in a league.
While Yahoo! does not remove teams from leagues after they have drafted, any failure to follow all of the items listed above might result in the limitation or removal of playing privileges for the offending owner. These restrictions might include:
1. The suspension of specific game privileges (trading, message board posting, etc.) for the remainder of the season.
2. The suspension of all playing privileges for the remainder of the season.
3. The complete deactivation and removal of the corresponding Yahoo! account.
4. Any other action that Yahoo!, at its sole discretion, feels is necessary to restore fair play to the league.
It is the responsibility of team owners to monitor activity within their leagues. As an owner, if you notice any suspicious or collusive activity in your league, please notify us at once so that we can investigate and take the appropriate action—if any is deemed necessary—against the offending teams and accounts.
I also read the terms of service and you did not violate that section either.
The problem is that when you email yahoo, you get some minium wage guy who would rather be at coffee break...