It is possible if this is a part of strategy - getting welcome and rating bonuses but even in such way - it is not a problem to see fast-made scam.
Agree, it's likely not that they don't read, but rather to take advantage of the bonuses that have been provided and walk away with all those bonuses. Then come again as if not paying attention to the terms and conditions that apply. As a beginner, it might sound silly to shoot more than $50-$100 without thinking. Usually, most beginners will be more careful because they don't know how to start well.
Casinos say that gambling should be just fun and a way to have a good time. The truth is, most of the gambling is based on a desire to make money easily and quickly, and oscourse greed. It is clear to me that many people, even if they are aware of the risks, will still play in casinos with a bad reputation just because they have big bonuses.