Inevitably some libraries will need replacing. In some cases we've ended up rolling our own. But in these cases the time spent with the discarded library is not wasted. Rather it gives us a chance to understand the domain better, to understand our needs better, and ultimately to have better criteria for making our choices.
Things like documentation, support, bug fixing, source code, and so on have all become important parts of the evaluation process.
Interestingly our internal libraries are often less-well documented (if at all) the author is sometimes no longer around, and it usually has all kinds of quirks we work around. This after taking longer, and costing more, written from an unclear spec by people not terribly familiar with the domain.
And yes, we've hone the nuclear route of ripping out and rewriting, and that is expensive , but no more expensive than defaulting to "write ourselves ", and indeed usually cheaper because we have a better idea of what we want.