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I can not find a link to the source, but I read that there is no need to post more than four messages a day. I do not exactly remember why. Perhaps the system or users will accepted you for a spammer. But I can be wrong. You need to ask someone who understands the issue.

There was/is(?) a limit of 4 posts before payouts for the posts reduce, but |i don't know if this is still the case, and I think there may be changes ahead with Hard fork 20 and RC's -Resource Credits:
https://steemit.com/bandwidth/@steemitblog/blockchain-update-2-hf20-progress-and-bandwidth-changes

May be. It's a bit difficult for me. I still do not fully understand all the principles and rules of the system. Thank you, Ophelia.

I think everyone should do what works for them and what's comfortable. Afterall we have ups and downs with payments, so its good to use the opportunities :)
I think it's not spam if enough people enjoy the posts. It's often visible from the comments ^^

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