Those of us who aren't fans of yellow walls still appreciate 1 tk tips in general. I'm not going to stop someone from tipping their last token by setting a minimum.
When we have a chatty room full of people that have already tipped generously, a wall from someone can really hinder the overall vibe of the room. It could seriously annoy other members in the room who tip in a more convenient fashion. It slows down the chat, hard to see replies to questions I've verbally asked people in the room. The tip sound interrupts the music and my voice, so if a wall continues long I have to mute my computer.
Token walls can be seen as an attention ploy. I'd always prefer someone come in and drop a 50 token tip than 50 1 token tips. I see a 50 token tip as a very nice gesture, and I see the 50x1 as being an attention whore.