If I really like the whisky I keep the bottle - unless I already have an empty of the same in stock or I'm sure I can get another one fairly soon and easily.
Interestingly enough, in India there is a market for quite a few items - most popularly old newspapers and empty glass botles - that would otherwise be thrown out as trash in other parts of the world.
It gets picked from your door and the collector pays you by the kilo for old newspapers or by the count for bottle. The bottles most in demand are 650 ml beer bootles that get sold back to the original breweries.
Whisky bottles are more difficult to sell as most come with a goala cap on, precisely to prevent this sort of recycling. In case it's a normal bottle, and you live in the "right" neighbourhood, then an empty the Johnnie Walker Black Label is the one that fetches the maximum returns.....by a long, long way. The standard cliche here is that there's more "Black Label" drunk in India than that actually bottled in Scotland.
Then there are numerous "experts" who profess to have the "formula" for the best match of Black Label using Indian whiskies.
Luckily, at least so far, empties of malt whisky are still not a sought after item in this market.