Maybe you should read the forum guidelines again;
http://www.mmo-champion.com/threads/...rum-Guidelines
And, yes, discussing an episode that aired just hours earlier is absolutely, definitely still a spoiler. The thread title doesn't have the spoiler warning in it, so you use the spoiler tags.
Look, if you want to go against this, feel free. I won't. I'll be spoiler tagging every single word I deem a spoiler, and that's the end of it. Feel free to be driven nuts.
Also, if the spoiler tags bother you, get a custom CSS addon for your browser and modify the CSS on span.spoiler to something more your liking.
The first season is a measly 10 episodes. You can basically fit 10 episodes in one day if you want to. Hell, 24 fit 24 episodes in a single day. Doing 50 episodes in this world is a piece of cake, not a problem at all.
Although, I'm not sure where you get the 5 seasons from, though. Have they said they're aiming for that, or is it just some random number you came up with? 8 seasons typically is the goal, as that's when shows tend to go to syndication, although this being HBO I'm not sure that's the case; I'm not that knowledgeable about that whole thing. It could run for three, four seasons. Galactica only had four, although it had 75 episodes total.
But yeah, I wouldn't worry about source material.