Great, good start.
So, let's rule out XGUI 100%.
Try straight from game or even server console (or both).
In game console, type in "ulx rate ^ builder 1"
If no errors,
Did it increase your count? What scoreboard are you using?
Where did you post the code (filename, and path, and posted on server path not client, right?)
Additionally, when pasting the code into a file..what did you use... Windows notepad?
Reason I ask, if windows, depending on settings, notepad will save <anything>.lua as <anything>.lua.txt and Windows explorer will hide the .txt from you, therefore never getting included when server starts.
If using a nonstandard scoreboard with ratings on it...does increasing rating the 'normal' way work?