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If it happens frequently, it may be looked into, but if you're not doing anything wrong then there's no problem.
JOAT
And now i have to retype it! :(
But im not going to.
Basically, yes, bad practice, as it is entirely unecessary. Your ranking is based on content and inbound links. It makes no difference how often you resubmit.
If you're trying to get listed for the first time, then your best bet is to get a link from another site.
JOAT
Fiction: A website will be removed from Google's index if it's 'over-submitted'.
Fact: We do not require submission nor do we penalize sites for 'over-submission'. You are free to submit as often as you wish. However, given the nature of our inclusion process, your time is better spent improving the content and links of your site.
It's helpful to me to spend time on all the search engine guidelines pages. They don't explain everything, but it really does help.