My #1 reason was to stop thinking about my weight issue 24/7.
Being overweight consumed my every waking moment.
I was thinking about how tight my clothes were, how large my breasts looked, how out of breath I was, how these fat rolls look sitting down, what people are thinking, how hot I was all the time, wondering if I smell bad from sweating, if my pants were going to fit in the morning, what am I going to eat next, will I ever feel sexy again, etc...
Those thoughts don't consume me 24/7 anymore and that is the best result from losing 60+ lbs., along with better health, fitness, cuter clothes, being cold instead of hot, being called tiny and thin, and people generally being more attentive and kinder to me.
And yeah, I feel much sexier.