No, I'm usually on the other end of the stick.
This has never happened to me personally, but there is little doubt that it does happen. I do think we have to be careful when drawing the conclusion that interested was piqued *because* of the ignoring, or that the interest that arose was genuine romantic interest. Sometimes people are not in the right head space when someone initially shows interest (due to a recent breakup, feelings for someone else, etc.), but by the time they are open to the idea of romance, their initial indifference has offended the once interested party. It's also possible that it boils down to the fact that people like to be liked. If someone ignores us, it may drive us mad for reasons aside from romantic interest. Or maybe some people just prefer to be the pursuer? There are tons of possible explanations.
why does that happen?