http://mkt.unwto.org/sites/all/files/docpdf/unwtohighlights12enlr_1.pdf
hilights: number of international tourist arrivals in 2010 for South Asia is 11.5 million. In comparison, SE Asia got 69.9 million.
number of international tourists to Bangladesh in 2010 was 300,000 people who spent $81million. That's for the whole country. That's barely enough money to build one reasonable 5-star hotel. Do you really think there is enough capital and infrastructure in Cox's Bazaar for 50(!) 5-star hotels? Come on...
There are probably like 5 or 6 five star projects, rest of the other projects are time share apartments being sold to customers are "5 star hotels" or just your average budget hotels.