We're talking mostly with radio 30 of years, those who buy today are those who dreamed them new,mostly people between 35 and 50 years.
if you've been lucky, you'll have a job, your house and your children are already educated,relative economic security, allowing you to begin to give luxuries.
to increase demand, as all causes prices to rise, because people with "good pocision" have money to spend,
Example

ne men , when I was 17 and studying could not buy one of those radio saw in stores,today have 45 years ,and is a professional and well-paid, and pay the house, educate their children and one day see the radio on ebay you always dreamed ,only the limit of what he wants to spend will stop.
demand will continue to increase as people feel desire for them, when we get old and leave this world, demand and prices down too.
generations who come after us will have other dreams and things to seek and desire,is as simple as life itself.
Some models have their place secured in high prices and desire, surely, but not everyone models will be in the higher price range for ever.
as does a 20 and a few years young , in order to acquire something, that there is a person who has almost settled life and is willing to pay anything for something?
is very difficult to do, unless you're willing to deprive you of many things to get to your dream.
Luckily those who began collecting 10 years ago, when they were not wanted by most people of his generation, for which recently started two things or you're lucky or money,We are in a good time to sell,but dad to buy.
part of what I said, I know for my other hobby, the clasics cars, it is not one that I can not afford,in the late 80s, many car models of the 50, exceeded 75,000 to100,000 dollars,Today you can buy for less than 50,000.most people who dreamed of these cars, or no longer drive,or moved to another neighborhood which does not become.most of which have 40 to 50 years we will not restore a car of the 50s, but yes one of the 70, there are the muscle car prices today.
nobody sought a hemi, camaro or mustang in the 80s, but today yes.
another problem, comparing cars with radios,There is an entire industry supplying parts and reproductions for cars , which does not happen with radios
you can build a mustang almost from scratch, but not to a m90.
for those who are younger, it will be more difficult, as we're treading this world, willing to pay for something I dreamed, and we could not afford,when we were young.
I wrote too much for the 4 and 22 am