Banning accounts isn't a solution since the spammers will create other one...
It is a solution in some way, because they'll get tired registering new e-mails and accounts. Question here is if it would require a lot more time for the MODs (or more MODs).
Not really, you don't need a valid email to register in this forum.
I don't see how spam can be reduced, other than checking IP's and banning multiple-accounts (which I think is already being done) rather than a singular offending account that contains the same IP.
Education is really the best way, but if we force it on people they are likely to leave the boards especially newbies as they may already feel uncomfortable with something revolutionary, such as Bitcoin, for instance.
Note regarding the email not required to be valid: I assume its for privacy reasons, this board respects privacy or so it seems.
Here are some tips to reduce spam but may be detrimental to the new users experience:
* Add a email verification proceedure
* Add a Captcha system when registering
* Prevent IPs from making more than a certain amount of accounts (currently, its unlimited).