@geetasnani lession learned...believe in yourself because, if james had a thought and vision that what he is doing is good work and profitable in the future then hopefully he was going on same path.. so, In 2009 he had 7500 bitcoin if he kept going and was doing the mining. he might earned minimum (including diffeculty level)
7500 more bitcoin in next 4 years e.i. 2013 means total 14000 bitcoin in next 4 he was able to earn. And see now its 2018 He could be the most profitable and biggest bitcoin holder and miner in the world. Even bigger and richer then satoshi nakamoto.
he lost trust, he lost opportunity and his own wheelpower so, he missed and lost everything.