thanks for coming
Meaning
An expression of gratitude for coming somewhere, having been invited.
A sardonic expression indicating that the addressee's contribution has been inconsequential.
Source: en.wiktionary.orgExamples
If I'm not interested in a woman, I'm straight-forward. Right after sex, I usually say, 'I can't do this anymore. Thanks for coming over!'
Thanks for coming tonight, on a Sunday night. Sixty-Minutes is on and there are probably some good stories you're missing. Thanks for choosing Silverchair over Sixty-Minutes.