If it's on the internet, then it must be true?

Had a guy come in to the shop with some silver dollars that he had recieved from his aunt when she died.  There was a mixture of morgan and peace dollars.  He also had some wheat pennies and 3 red seal $2 bills.  Everything was circulated.  Most people, unless they are serious collectors, find something interesting when at the bank, or when receiving change back, collect out of circulation.  They typically didn't buy it from a coin dealer, with the intent to build a collection.  They saw something they thought was cool, or something that had silver.
Out of the items this gentleman brought in, the silver dollars were what he was focused on. He had "done some research" on the internet and came in to discuss what he had found. He found a site where a silver dollar with the same date selling for several hundred dollars. He obviously was wanting me to pay him the price that he had found(he couldn't remember the name of the site he found the prices on).  As we discussed the coins and the information he found further, he was unaware that different mint marks greatly impact the value of the coin.  Also, as discussed in previous blog posts, condition is a key factor.  But this person persisted, "I saw the price on the internet, and I think the coins are worth that price".
I didn't have the heart to tell him that his common dated, common minted, highly circulated silver dollars were nowhere near the value that he thought they were.  I simply told him that he should treasure what he had received from his aunt, and possibly pass them on to his kids or grandkids.  Generally speaking, coins that are collected out of circulation are going to be common, and are going to show significant wear, but thered are exceptions of course.