yep...they are worth their face value and nothing else,if they are mint or unused...
any postage stamps that you buy today for collecting,will always be worth their face value for use in mailing...nothing else...
only the classic stamps,errors or something that you find unusual or only one of a kind,are worth any amount of value...and then,only what a collector wants to give you for them...nuff said?
don't get me wrong,stamp collecting is fun,educational,good therapy and all of that,but if you want to make a fortune with it...forget it....it won't happen in your life time...