1) What happened last year doesn't mean it'll happen this year. FSNW did simulcast the OTA games. Look at the Seattle schedule and you'll see tonight's game is on KSTW.
http://seattle.mariners.mlb.com/NASApp/mlb/schedule/index.jsp?c_id=sea
2) As much as I'd love to have a bourbon with you Charper1...The blackout info you listed has nothing to do with the way MLB enforces blackouts. Go to this site and look at the zip code database for the Giants.
http://mlb.mlb.com/NASApp/mlb/mlb/subscriptions/mlbtv.jsp
In here, you'll see my previous zip code (89121) when I lived in Las Vegas. The Giants claim Las Vegas as "in-market". Even though DirecTV and Dish carry Fox Sports Bay Area, they do not broadcast the Giants games in Las Vegas. Further, there is no OTA source for the Giants in Vegas. The Giants play 600 miles away from Vegas, yet they are "in market".
It all comes down to the MLB and Giants being greedy. Rights were sold to Rainbow Media. Those rights have a pretty generous geography for what is considered "in-market". The bigger the geography, the more money Rainbow has to pay for the rights. Now, Rainbow owns the rights to broadcast the Giants in Vegas. They had a deal (up through last season) with DirecTV that allowed the Giants to be shown to customers who paid for the sports pack. Negotiations for this year must have fallen through. It was posted over at DBSFORUMS that customers in Vegas received a post card letting them know the Giants and A's will no longer be seen through the sports pack. Rainbow must have put the squeeze on D* for more money and D* said, no...(I believe it has to do with putting that money into deals for the Mets and Indians..).
Bottom line...blackouts have absolutely nothing to do with geography, OTA, or enticing fans to go to the stadium instead of watching it on the boob tube. It's all about obtaining the highest value for broadcast rights. (IOW,,,screw the fans!!!)
As the rules changed this year for Giants and A's in Vegas, they must also have changed for the Mariners.