Its a similar dynamic for all kinds of alt coins across crypto even when some of them are more capable and possibly with greater growth potential then the original crypto currency Bitcoin.   Its because I think alot of alt coins receive purchase in bitcoin not cash, yes there is a link to cash for alot of coins but maybe the main pathway is Bitcoin itself.    

So the price of Bitcoin sets the gold standard for the value of all other crypto to some extent.   Maybe it shouldnt be that way but as the original and longest standing blockchain it has the widest path to dollars.
Of course you dont have measure success against Dollars anyhow, that in itself is a failing standard from 60 years or so ago.   Its broken a long time now, its only stlll there at the centre of global trade because of politics   I'm sure I remember some famous phrase, if you only measure your progress by the competition you will never really succeed.    I hope to see many crypto standards surpass Dollar for integrity and worth to its users.

Because they are in a Cave man, not too much sunlight or wind passing through there.  

Have a read of the whitepaper.

I joined up looks good to me.  Not going to be a referral whore here as I personally hate it when others do it but they do have a referral program.