A thread full of (awesome) fan art, pre-made fanfics and headcanons (often involving romance and squeeing) while knowing nothing about the character and the occasional speculation and dab of information as given.
Sometimes rather entertaining, other times 
Nailed it.
It's just for fun. Speculation about the unknown is fun and is done in most if not all fandoms.
Because Dragon Age is a companion based RPG, it is natural that fans discuss various elements of companion relationships. Given how much importance we place on love and relationships in real life, it is also natural that discussions about characters with whom you interact with consistently involve taking those relationships to the next level. ie romance
Not to say that it isn't taken overboard sometimes, but the heart wants what the heart wants. Pretty sure most people here are aware they're crushing on pixels. Doesn't make it any less entertaining to roleplay relationships you aren't likely to ever experience. I mean, I highly doubt ill become a space marine an have space cuddling with another soldier or kiss a handsome mage after they barely survived an explosion.
Its part of the experience and I personally love every bit of it. You can talk about anything you want.