There is no specific reason behind this but one thing is sure Satoshi want some better security and indepence so he done this all for us now thousands of member in this community can go through just because of this bitcoin and achivement their targets just because of bitcoin otherwise we have many serious issues with other financial institutes and their policies.
I once read an article that actually Bitcoin was only famous among gamers...
correct or not please correct me;
*satoshi consciously created Bitcoin just to make transactions between gamers easier. btw, I never really thought hard about what satoshi's goal was to create Bitcoin, which I know Bitcoin is a future decentralized asset that will be very valuable and independent.