Well. Some people, like hedge funds or hypothetical corporate-takeovers, will always be interested in paying for them because it's a way to turn money (sitting around) into more money (in the form of a stream of income) - whether through a full-on acquisition, stock buybacks, or due to dividends. Assuming they get a good enough price, naturally.

Other people will pay for them because the first group will pay for them. That's not ridiculous, that's just a transitive property of things being worth money. It's only a problem and a bubble insofar as this group's enthusiasm overwhelms the first group's.