This is walleye rick, administrator for this forum. I've been in contact with the VBulletin and the spamming is being generated by automatic 'bots'.

I will be upgrading to the latest version of software and they say this will have better protection built in. In the last several weeks I've deleted over 500 spam subscribers but can't keep up with it manually.

Hang in there as I hope the new software will help eliminate much of this garbage.