Concur. I am a 25% or more tipper and NEVER tip for to go.
I have tipped then waitress for to go if they do something special, like include extra items because I am so cute.
Three years in a row my kids and I ate Christmas breakfast at the same waffle house (travelling). The first year I left a $20 tip and the 2nd year a $40 tip. Kind of a fun thing to do on that day of the year (at least for us).
The third year my oldest son was working a good paying job and together we left $75.