I am losing weight. When I went over 230lbs it was time to reduce. Some people look at the weight of the components on their bike one of which is the rider in order to increase performance. Not to say less weight will increase my skill level however no one would deny that it is healthier as you age to weight less. .
Down 22.2 lbs today in 12 weeks. Weightwatchers works for me. Just as possibly you ride better when your amigos are watching so the desire to lose weight increases when you know you are going to weight in each week in front of others.
remember - It is all about ins and outs. Put less in (food) and take more out (excercise) and the weight will reduce.