It was hard to tell whether they were tooting at us or not. Still, no harm done if they were. If they were, and they're reading this, maybe they could come to the next munch and join in. They seem pretty similar. Ok, you'll be happy as well.
Some people prefer to deter potential lurkers, and give an e-mail address to contact for details.
There's no catch involved here, they're just a bit more nervous about getting undesirable munchers. Credits Part of Informed Consent - a UK BDSM website.