[radradrad]

IMO, most people are 'predictable'. Tight players are maybe MORE predictable than loose, but even if you correctly think someone is loose, you have indeed predicted how they will play to some extent -- loose. Predicting that they will be unpredictable is something in itself. Maybe it is too dangerous to predict when they will FOLD because they are apt to stay in with anything. However, if you turn that around, you might instead predict that they will make a flippant call -- if you play it right. For example, you may have the nuts but choose to make a raise in a flippant manner. Maybe shrug your shoulders and push all in. If the guy takes that as you comming off the tracks, he is more likely to follow you in than a tight player. If you know that, you can play it. That said, I think it's more dangerous to try to use your 'powers of prediction' against loose players. Hope that comes across right.
One more thing. I used to play a game professionally -- not a card game. What I found was that when I played novices I had a greater chance of losing a ramdom game. Not in the longrun -- overa series of games -- but a ramdon one here or there. Their luck born of ignorance, and unpredictability of play is why. I look at the loose player the same way.