It would definitely be a lot less spam.

The problem you create at the moment is that with every transaction the size of the block chain grows. With it so does the cost to witnesses, such as my self, to maintain servers with enough memory to continue to operate. This is being addressed and will change in the future.

One person memo spamming, comment spamming, follow spamming or vote spamming isn't a problem. It's when others see such activity as acceptable and decide to do the same.