I say ignore the ones screaming at you. Yes, you have a lot of followers, but each one of those followers is also following a bunch of other people - such, it is not your responsibility to even try to support all, or for that matter, any of them.
You are a role model because you do give that much back to the community. You actually do answer comments - which a lot of other big fish don't necessarily do. I am not saying that they are wrong not to answer. For all we know they are busy supporting the community in other ways.
But one important way, and I think it is the one you have chosen, is to model positive behaviors others can follow. So, instead of screaming at you for not supporting them - they can look at what you are doing and start to do the same.
Anyway, I am just babbling now. But you give a lot to the community and have guided others to do the same. That is more than enough.
I think the best policy is to ignore the spam type comments. Or when you feel really generous and have some time, paste a link to one of your posts where you explain how to be successful. But that might be wasting your time.