Yes it is worth it to spend in signature campaigns. Many people do not visit the altcoin section and announcement thread because they just want some information about bitcoin or only concern of earning bitcoin so it would be good if your ICO would be seen all over the forum. The first thing that I notice when I was new in the forum are the colorful signatures so make sure that your signature design would be attention grabber and not an eye soar in order for the people to click it and visit your site.

If you want more people to wear your signature then pay in bitcoin because it is paid weekly as oppose to signature campaigns paid in altcoin section which are usually paid after the ICO and some people can't wait that long because they needed some money. A high rank member would also have a weight in wearing the signature so if you pay in bitcoin, some high rank members would participate but if you pay in altcoin, maybe only a few high rank members would participate. You can also pay in bitcoin and altcoin because many ICOs are doing that now.