As someone that opens up hundreds (or thousands) of tabs regularly, I close each tab after I'm done with that specific tab, and it would make no sense to close it before that. But because I open most of my tabs from pages which contain a lot of links, like search results or link aggregators, and because each of those tabs may in turn generate even more tabs because they contain several relevant links or may raise questions which lead me to throw some more queries at my favorite search engine, it takes quite a bit of time before I take the first peak at most of the resulting tabs, so they end up sticking around until I go through them, one by one.

I don't want to just close them. I want to save them and have them searchable later, like I said above.