Spamming comments is frowned upon by the community. Comment spam is currently defined as:

• 10 or more generic comments per day that are not in response to a question posed by the post or comment. “Thanks”, “Great Post!”, “Great Photo!”, “Good”, “Like”, “Nice”, “Wow”, “Cute”, “Follow me”, etc.
• Commenting on old posts to hide self up-votes or a voting trail.
• Copy/Paste comments that serve no purpose or the purpose is self promotion (including copying and pasting similar comments in rotating way).
• Comments that inform the contributor that they have been up upvoted, resteemed, or flagged when the curator does not actually upvote, resteem, or flag the post.
• Unsolicited and off topic referral links.
  

Continued comment spamming may result in action from the cheetah bot.

More Info: The Art Of Commenting.

Those who insist on posting a high frequency of low quality posts or comments are likely to face increased scrutiny from @steemcleaners and other anti-spam entities on Steemit.