Bitcoin was difficult to buy in 2010 and in 2013 because many people have not known what's bitcoin, secondly we need to know that buying of bitcoin has become an easy something due to the numerous existence of exchange, because I could remember far back how difficult it's to sell bitcoin, selling or buying of bitcoin is something that's been done physical p2p and some people get bitcoin through referral bonus and also in bounty, but now internet has made purchasing of very simple, which exchange can sell bitcoin for you once you are verified
Back in 2010 process was difficult and risky challenge because there were very few places to get it and most people did not know what it was. It was mostly bought and sold directly between people means P2P and sometimes through forums or as bonuses. Today internet and creation of many secure and regulated exchanges buying and selling Bitcoin is as simple as creating account and getting verified which has made it much more accessible to everyone.