Edge case 1: You're the first to send them a message! Edge case 2: They just deleted everything in their inbox. Edge case 3: They have a particularly polarizing

Edge case 1: You're the first to send them a message! Edge case 2: They just deleted everything in their inbox. Edge case 3: They have a particularly polarizing outlier property (e.g.: a very intense fetish for something most people would find disgusting). Edge case 4: Some quirk (or maybe even a bug!) of OKCupid's matching algorithm is pushing that user far far down in most people's priority / match % lists. Edge case 5: OKCupid's matching algorithms are functioning well, but the person is just that peculiar of an outlier in that algorithm that there's just very few active users who are going to be matched well with them. Just off the top of my head. And then consider that, by the context, they probably meant anyone who hasn't had a new message in a while. Yeah. TL;DR: Lots of good reasons.