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Yes, sometimes it's easier to implement multiple certificates instead of one master certificate designed to fit all occasions. Typically this includes cases of sites that serve up their content without a www. prefix, or those with multiple domains and subdomains requiring SSL coverage.
PositiveSSL certs are inexpensive Domain Validation SSL certificates which are issued instantly and cheaply, and include $10,000 Comodo warranty (mostly because they can be validated automatically.
Up to 250 domains, IP's or SAN's can be covered by a single multi-domain SSL certificate. They aren't cheap, but they do give umbrella coverage to an organization which has many domains and would otherwise need multiple single-domain certificates.
EssentialSSL is simply PositiveSSL with a few upgrades. With an EssentialSSL certificate, you can get free EV upgrade, free 24/7 technical support and most importantly to many, you get the free use of the Site Seal which is a key trust signal for those who are shopping at your site.
Regular SSL certificates protects a single domain, period. Wildcard certificates protect a domain and all the subdomains associated with that domain. Keep in mind that the wildcard certs are not available with Extended Validation. So, if you have a wildcard cert, you won't get the green browser bar!
The list is too long for just one sentence - check out the big list of reasons below!