I (hope I) never edited a question just to remove a Thank you. But I always take it as a motivation to improve a question.
I check the title.
Can it be made more clear? Can it be phrased as a question?
I check the body of the question.
Are there typos? Grammatical errors? Wrong capitalization?
I check the tags.
Is the question correctly tagged? Missing tags? Non-sensical tags? Maybe even an option for a tag-cleanup?
In my opinion, only fixing a Thanks in a question sends the wrong signal.
If someone still feels like the majority of an edit was invested in removing a Thank you and he complains, I'd explain that we like to keep a high signal-to-noise ratio. Meaning, we like it when what we read conveys a lot of information.
While a Thanks! can be nice, it distracts from the problem at hand and is simply not necessary.
The SuperUser way of saying Thank you is an upvote, and it should be applied to a helpful answer, not be appended to the question itself.