Nah it's no big deal, $2 or $3 covers "a match with the A.I.", and Demigod was so non-priority for me, I tacked it onto my purchase at the very end as an afterthought. The taco salad I bought today was more expensive and I only enjoyed it once, naturally.
I think the reason I bought Walking Dead is related to why I kept playing TSW (I did finally stop later, but just because it's not my main game). I haven't really played any psychological horror games or overly gory games in years. They're much more realistic now, and combined with this thing I have called an overactive imagination, there can be deep immersion when I'm really into a game (or book or movie or whatever). TSW was hard to stomach in places, and even though I'm not in the habit of freaking myself out unnecessarily, I tended to play late at night with all the lights off for added effect. I just found it so amazing that the game was having an emotional impact on me. I've played a number of games over the years that elicited other kinds of emotional reactions, like anger or sympathy when bad things happened to good characters. Feeling fear over a video game was unique. It wasn't pleasurable at all, and yet I kept going back for more because, well I don't know why exactly. I guess there was another part of it that was pleasurable, and may have been therapeutic too, facing down waves of zombies until I could do it without feeling much sensitiveness. Well it wasn't the process that was pleasurable, but the victory over the fear that feels good--when you and your friends are all "safe" for the moment, and the monsters are destroyed. Taking something that repulsed me initially, learning how to face it (and destroy it), that part of The Secret World is probably symbolic in some subconscious way, and The Secret World is very good at raising the stakes and dredging up bigger and scarier monsters to reward my determination.
That was a very long paragraph!
Anyway, all of this was somewhere in the back of my mind when I made the Walking Dead purchase. I have avoided the TV show and don't read the Walking Dead comics either. But I am a fan of TellTale Games, and I know they can deliver a good story.