Pinging RSS feed directories

Hi all!
A question regarding RSS feed and Blog pinging. I am thinking about using Feedshark to ping RSS feeds, but haven’t signed up on all of the sites that are listed. For example, I’m listed in FeedFury but not Goldenfeed (i.e. I haven’t yet set up an account, etc).
Both of these are listed as options in Feedshark. If I choose a site to ping me that I’m not listed in yet, will that cause an issue, such as being blocked as spam?
Is there an advantage of being listed on all of the feed sites listed in Feedshark?

I don’t know about Feedshark but why don’t you use Feedburner? It is good in RSS feeds…