Originally I never dressed up, but my divorced military dad could only get into me sucking if I did, so I gave it a go. Then I went on grindr and made a profile as a sissy, and could not believe the amount of new messages from guys. I literally could not keep up. I am slim and smooth to begin with, so I can reasonably pull off the look.
I realized that there were a TON of straight guys who would be open to being sucked by a sissy, but not by a gay man. The moment I dress up, all of these guys are suddenly interested in becoming regular feeders. I don't even have to put on makeup, and they will still go crazy, because to them a sissy is not gay in the first place. Nowadays I offer dressing up for guys because it significantly increases the pool of interested men, and lets me be extremely selective. For example, the bodybuilder dad that wants to meet me would never be interested if I presented myself as a guy.
At the end of the day I don't consider myself trans etc - it is just a fun game of dress up that gets me dick.