I think men should stop donating their sperm for a couple of reasons.
1. You should be getting paid for it.
right now sperm banks would "reimburse" men for the sperm they donate, meaning they would give them a couple of bucks when those sperm banks can get up to more than a 1000 dollars for a vial of the sperm you basically give away for free. look at this list of prices
I don't get it why women can get rich using their bodies whether they model or even work as call girls and prostitutes but men are supposed to let their bodies be used for free. I mean it's those men's fault they don't get paid more, because they're willing to donate it for free. but there's a really disgusting reason why men allow the society to use them for free. It's the same reason why men have died in wars throughout the history protecting people who don't give two shits about them. Men like being called heroes. they like the idea of helping and protecting others especially poor single women who want babies. just look what this Australian websites is telling men in order to cajole them into donating.
2. If someone finds the idea of having sex with you disgusting then they're not entitled to your sperm.
I don't mean women should have intercourse with their sperm donors but if you don't like a guy or guys in general then how can you like the sperm that belongs to them. Besides, some people are better left childless. i know that's harsh but we have enough feminists in the world. You don't need to help them reproduce using your seeds.
3. You're not allowed in the kid's life.
You won't be regarded as the kid's father even if he/she is being raised by a single mother. I think the fact that you're the biological father of that child makes you responsible for their life and just because you have no legal rights here doesn't mean you're not morally responsible to care for your child.
Finally this is my message to men: We all have assets that make us valuable to the opposite gender and whether you like it or not one of the reasons women start relationships with you is the thought of one day having kids and starting a family. One of the biggest assets of a woman is that we like having sex with them and can you see how carefully they protect that asset? When was the last time a woman told you " Hey i don't like you and don't want to be with you but i'll have sex with you for free. I don't care about giving it away for free." That should teach us how to protect our own assets and all i'm saying is if men are going to donate sperm and let their bodies be used by others they should charge them for it as much as they can just like women do.