1. I'm not interested in implementing this feature, but if you pay me then I will anyway
2. I'm not interested in implementing this feature even if you pay me, but if you write a PR for it I'll merge it
3. I'm not interested in this feature at all and don't want it even if you write a PR for it
If it's 1 or 2, then just saying that is good enough. If it's 3, then you should explain a little bit what's wrong with the idea.
1. I'm not interested in implementing this feature, but if you pay me then I will anyway
2. I'm not interested in implementing this feature even if you pay me, but if you write a PR for it I'll merge it
3. I'm not interested in this feature at all and don't want it even if you write a PR for it
If it's 1 or 2, then just saying that is good enough. If it's 3, then you should explain a little bit what's wrong with the idea.