Are staffs at a restaurant super nice to you for more tips?

Almost every staff at the restaurants in my city are super super nice and friendly and of course I tip them before I leave
I wonder whether they do this just for the tip?
(Which is not a bad thing)

Updates
1 mo
I don't want to get in their pants and I'm not talking about female staffs alone.. think before trying to post a meme answer
Are staffs at a restaurant super nice to you for more tips?
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