I don't usually run into this on private-based sites, but on token-based sites, I really don't like anyone but me even mentioning tipping, unless they're enquiring how much for something. It drags down the feeling of my room and never encourages tipping. In my experience, even the encouraging methods tend to make my viewers less likely to tip.
I've put a few tippers on ignore because they'd tell every beggar "tip, username" when they ask for a flash or something. Nono, that's not how we do it in my room, friends. When beggars demand stuff, I smile big and use my super-happy customer service voice to tell them, "I will gladly (request) for (amount specified in topic for that action)". There is no need for anyone to tell anyone else to tip. I've told these guys a few times to stop it, but they didn't, so ignore time. It just makes you look like a douche.
I also don't appreciate members whining to other guys about needing to tip if the token flow is slow. Shushy face. I use automatic goal renew for countdowns on CB, and do a flash, spank, or other fun thing at each goal of 25. I usually have planned ones that I'll do if the tipper doesn't specify what they wanna see. If I feel that the tokens need to get flowing, I start talking up the next activity: "Hey, guys, at the next goal, I'm going to suck my nipples/show you my butthole/spank my pussy, who wants to see it? Let's make it happen, I know you wanna see (activity)!" Again, there is no need for a member to tell anyone else to tip.
If a tipper tells other people to tip, I'll tell them on a couple different days not to because it brings the room down and doesn't work. If they continue to do it after being asked not to (in customer service voice with smile!), then they get put on ignore because tipping me doesn't mean that you get to talk shit to the rest of my viewers, and you're obviously not going to learn. If a non-tipper does it, I just explain why it's not OK, then temporary ban. If they come back and do it again, ignore and longer ban. If someone who tipped me isn't allowed to shit on my viewers, someone who's paid me sure as hell isn't.