Essentially, they lead you on. They seem like they're about to invest right up till the moment they say no. If they even say no. Some of the worse ones never actually do say no; they just stop replying to your emails.
I've never sought investment, but I always really disliked it when companies broke communication off after an interview or application without a firm rejection.
On the otherhand, I think I prefer diminishing communication when it comes to dating. I don't treat dating like an application process. Most of the time when I talk to a woman, I'm not trying to ascertain her suitability as a mate, rather, I'm just trying to make my day/evening a little more enjoyable by having a conversation. Sometimes those conversations turn into something else, sometimes they don't. If I text someone after getting there number, I think I'd much rather prefer no response (I get what that means) to some sort of direct rejection.
