It's not too late to board for the trip to the moon I guess.
This is amateurish speculation but I made some calculs :
Buying 21 BTC now ( at let's say 2000€) Will get you millionaire if the BTC reach 50k.
A really low prevision would reach 15k , and high expectations are going for 100.000.
No need to remember that having 21 BTC will also make you the holder of 1/1.000.000 of the Bitcoins that will ever exist.
And erm, yeah no , I don't have (yet) 21 BTC if you are asking.
Edit : well this is my 21st post on the forum.