That can be said of anyone who's trying to interest you in any moneymaking proposition. So, rather than simply questioning their motives, try to determine if the arguments for a higher gold price are valid, e.g. debased currency, artifically suppressed gold prices, etc.
For hundreds of years the value of gold in say, dollars, has not kept up with everything else. So, before I decided to expect real gold prices to increase, I'd first have to determine that gold demand was going up-- like maybe a new jewelry fad or sudden need for window lettering maybe.
I find the track record for stock prices a lot more convincing.