Saved Sellers and Saved Searches are both a buggy mess and neither should be relied on. The discussion boards are full of complaints about users not receiving Saved Search emails, or else receiving emails from zombie searches that cannot be found or deleted. Likewise, users complain of being unable to add or delete Saved Sellers, despite being well under the limit of one hundred.
Your best bet may be to find a completely different way to keep track of searches and sellers that you have more direct control over -- by using bookmarks of searches or sellers' "items for sale", links pasted into an email, or third party automated search tools. Google "automated searches ebay" for some possible suggestions if you like getting emails when new items that match search criteria are listed.
