Frankly, I'm fine with manual spammers. If you open the new tab on Steemit, you'll see that the signal to noise ratio is around 1%.

I don't see much difference between a spam post and a low quality post that was an honest attempt. Most of those posts don't make their way to the homepage, trending, and new tabs in the current system. This won't change in the tipping system.

In the tipping system, the spam that makes their way to homepage, trending, and new tabs won't be able to profit from the reward pool. If some people tip them with their own money, fair enough, that will be their choice.