I would say they're doing it for their dikk.... bragging about it to other nikkas is a bonus to them.. But as someone who never even tells his best friends who he smashes, unless it's my girl... I can promise you, we'd still go for the best looking women, no matter who knew about it.
I never said anything about other men. I am talking about spending decades improving ones self for other people...and not even people on your level. Just seems an odd thing to aspire to.