99.9 percent of the time I just like looking at the glass. But in this case, if you were to take away the lids, and then the labels, and then the contents, there'd be almost nothing interesting left to look at, because these are just plain clear bottles underneath it all.
So yeah, if I did collect this sort of thing, in this case I guess I might keep the contents! If it were some beautiful colourful pontiled bottle with some lumpy brown sludge sloshing around inside, I'd probably clean it out...