Nexus devices are the reference devices that were supposed to be used by developers: at the Google I/O conference, each attendee received a Nexus 7, Nexus Q, and Galaxy Nexus (http://www.computerworld.com/s/article/9228585/Google_gives_...). If you have a different opinion of what Android "reference devices" are, then provide them for evaluations by the denizens of Hacker News (of which includes a number of Google employees).
It is not necessary to "ask yourself who the real profit makers are," because the revenue numbers for HTC and Samsung are available to the public. The numbers state that Samsung is alreaduy generating more profit than HTC by a significant margin. Samsung's numbers have been increasing. HTC's numbers have been decreasing. Here are some articles that perfectly summarize the point:
"[HTC] posted its third consecutive drop in profit after cutting its revenue forecast amid competition from Apple Inc. (AAPL) and Samsung Electronics Co." (http://www.businessweek.com/news/2012-07-06/htc-second-quart...)
"Soaring sales of smartphones lifted Samsung Electronics Co.'s profit to a company record in the first quarter and executives said that a new model hitting dealers next month will fuel its financial results during the second." (http://online.wsj.com/article/SB1000142405270230472330457736...)