Being cheap and easy is not a problem, quite the contrary. That we as a society make this a good thing for spam is a problem, but I don't want to make the system shittier just because of the bad use of it.
My work email is virtually useless at this point due to the absurd quantities of spam I receive. I think the OP suggestions would actually make email less shitty.
Any communication medium that is cheap and easy will be relentlessly abused by spammers.
Any communication medium that is cheap and easy will be relentlessly abused by spammers.