I see following advantage of BD for a good investment destination.
1- Logistically it is easy to cater to India, China ,Srilanka, Nepal and BD market itself
2- India and BD has good relationship so it can easily use Indias land routes to export its product to Middle east either with help of Indian ports in Western India or BD port.
Wise and austere analysis @Kaniska . I agree with you 100%. When the Sonadia Deep Sea Port is built, Bangladesh will be the origin source to which much trade will link Northeastern India, Eastern India (particularly the land locked regions), Myanmar (particularly the land locked regions), China (particularly Kunming, Panzhihua, Zigong, Chengdu, Mianyang, Golmud, Xining).
This trade will encourage greater infrastructure projects in Bangladesh, particularly the reinvigoration of their nation's highways, as well as encourage greater railway systems to link Chittagong, Sonadia, to as Dhaka, to Mandalay, to Thimbu, to India's Kolkata, Shantiniketan, to Jalpaiguri, to Kalimpong, to Darjeeling.
Bangladesh will become a hub of major trade , linking major cities and provinces from many, many nations.