I am LGBT myself, and I think that, unfortunately, you are probably correct.

This is unfortunately something almost everyone is guilty of (LGBT activists included). Once you politicise an issue, people begin to twist the facts, misrepresent data and select evidence that is perceived as supporting their own view point, while tossing aside evidence that contradicts it. Everyone wants "the science" to come out in their favor.

This also comes from the fuzziness of the boundaries. Many men who are attracted to other men will not admit they are bisexual or homosexual. This is why the term "MSM" aka men who have sex with men is sometimes used.

It is easy to find conflicting stats because sometimes the definition used is self-identifying homosexuals, people asked if they are MSM, or physical arousal tests. The self-identified definitions are all part-right, since self-identification is disincentivized, but for the sake of science the clearest definition, and one of the smallest estimations, is probably the one we'll see used.

This is a question I had recently, with the brouhaha over transgender bathroom rights (with serious economic consequences, including concert cancellations, businesses moving headquarters, and the NBA All-Star game relocating). How many transgender people actually exist in the state of North Carolina? How many dollars could we have simply put in each of their pockets if all the ink, advertising and vitriol expended on the effort had been rerouted into cash payments to them?