You can mute #MFCtip as most girls keep that hashtag in their autotweets. Won't get rid of them all but it will get rid of a lot.
Honestly, I see it as the same as someone tipping publicly in my chatroom. They want to be publicly thanked for their generosity/purchase and they get it. If someone doesn't want to be included in an autotweet they can tip me ninja/hidden, even offline. It won't tweet if they do it that way. And it absolutely increases income, I've had people tip me offline just to see my autotweet (had it as a different "cat fact" for a while). I get more and bigger offline tips when I have them on. People like attention and they can get it that way. Plus most of the ones I see are fun, I'm happy when I see a fellow model getting offline love as are their supporters.
Of the last twenty I've down voted not a single one had #MFCtip hashtags, but maybe it will help.
I totally agree that guys want to be thanked for their tips. I'm less sure about how many care that they are thanked publically. But more importantly, there is a world of difference for wanting to be recognized in a chat room and wanting to be recognized on twitter. Tipping in chat room is generally part of countdown and encourages other to do it. I've felt zero incentive to tip offline just because somebody else did it. A decent percentage guys don't even have twitter accounts so they get no benefit from the auto tweet, and even larger percentage have twitter accounts solely to follow models (primarily their camming announcement).
I'm glad you think it's increased your income, Just be aware that while it was possibly mildly entertaining for the first month or two when not many models did it, when more than 1/2 of my twitter feed (which is 3/4 models) was auto tweets, I said enough is enough and started taking steps to cut it out.
I almost muted a model, I've spends tens of thousand of tokens on over the last several years, before I finally decided I could just down vote her auto tweets. Not only did she lose any off line tips, I almost muted her, which would have lost her more tips since I wouldn't see her coming on cam tweets.
The manyvids tweets at least have a sexy picture of the video, and may inform you of video you weren't aware existed, but it is pretty much spam also.
I have zero problems, with models asking for offline tips. If there is prize associated with high tip, I'm totally cool with them updating it. If she gets big offline and wants to gush about it that's fine also.
MFC has a really simple way of us following our favorite models progress it's called rank and again if a model wants to encourage offline tips to help her rank that ok too.
But the auto tweets, they are spam.