You are being paranoid.If no one profits out of sharing your images you should be grateful the word is being spread about their existence.And even If someone did want to profit out of your images he can easily use photoshop to remove the watermark.The watermark protects nothing,it only ruins the presentation.
You're right, photoshop can remove the watermark, but I've had enough of my work stolen to at least motivate me to make it just a bit more difficult for those who do. Even if it is a 5 second delay.
You are not really making it difficult.But whatever.These are your images so do whatever you want with them.I'm just saying that it ruins the presentation which is crucial for the ones interested in viewing and admiring.Since we won't go and alter an image in photoshop just to be able to see it.