Many people claim it is wrong to charge interest on loaned money. Yet they have no problem with charging interest (rent) to 'borrow' a dvd. We use the dvd, then take it back, what are we paying for?

We lease cars. We use them, return them when the lease is up, why do we have to pay anything?

How are these examples different than renting money?

Here's an example. If I have $100,000 I could invest in gold which will undoubtable increse in value, or lend it to you without interest, I make nothing and you have potential to make a profit with my money. Does that make sense?