For some its not about cost but about being able to poke holes, point out errors and the thrill of claiming to be proven right. They tend to be jerks with little concern given to what they do. They just love to antagonize others faults because of their own failings. For others its a misnomer that they think their helping the writer as they just belittle them. Read how many claim that they are 'just pointing out something' without giving meaningful insite (yes I misspelled that purposely) not knowing that it might get under the writers skin. Others don't care as they write in anger and hit that 'submit' button then quickly move on.

But you see like everything is some way it did cost them. For some they feel that their time was wasted reading something which cost them time but didn't stop when they could have. Or should have.

For others like writers it take time and effort to write something down and give it meaning. There are many stories I've read through that look more like manuscripts waiting for the writer to flesh it out only to have the writer say it's what they intended. Partial story writing if you ask me. For me that is a waste of my time and so forth and I've learned to quickly move on.

But for others like EoF, as with several other writers they work to put effort within their stories only to be slammed for a few mistakes that can slip by or misbegotten ideas that the reader doesn't know hay about. That's the time on their part which they should keep it to themselves as many readers don't care about it.

Future predictions are just that 'predictions' not really expected some of what we have now while getting lucky on what we do have. Just not in the form we expected. And when they can actually foresee into the future then I'm sure they'll know exactly when mans reign is about to end as with where to place the next bet on getting rich be it the lottery or stock market.

I'm still waiting on my flying car promised to me back in the 1920's. As with my jetpack.