Jim
It seems these spammers ( a.k.a. internet trash )are becomeing to be quite a pain in the backside. Another website I frequent is fixing to have to upgrade, simply because of spammers jamming the website with too much information. I don't know what upgrade will cost you, but it would not hurt a thing for you to solicit donations for upgrade. I think most of us could afford a small donation.
Just my two-cents worth.
Chuck Lee