Doing the fix yourself is almost always the easy part. Disclosing it and getting a patch shipped across the entire Internet is the hard part.
Maybe you mean that if there are many people like you, they’d want to integrate each other’s fixes. But then you’d probably have the combined manpower to start maintaining a true fork.
Also handy if the internet is running a DDoS reflector and you're being targetted.
Otherwise, usually no sense of urgency for fixes I did for me/my employer and want the rest of the world to benefit. My problem is solved now, everyone else can get it when it ships.