EJBs vs. POJOs

Architecture question: If I have four classes that work together to perform a service, what would make me deploy these as an EJB instead of simply packaging them in a jar file and deploying them to the app server as a lightweight component? I know EJBs offer security, transaction capability, etc. But if my four classes are fairly simple and don't need to use a transaction, isn't it easier and less bulky to simply jar them up and make them available to any client more efficiently? I have utilized EJBs and like them, however, for cases like I described above, I need to be better versed in the reasons to use one technique over the other so I can design appropriately. There must be some valid reasons to use the "simple" component (jar'd classes) in some situations instead of producing an EJB.
Thanks for any input or any help in pointing me to a good whitepaper or book that explains this. Most books and articles I read on EJBs explains the benefits, but I have yet to see a head to head comparison or recommendations of alternatives for "packages" of functionality.

What you are saying makes sense to me, if you don't need these services, security, transactions, clustering, etc. then you really don't need EJB's.
Here is an article on this subject:
http://www.theserverside.com/resources/article.jsp?l=Is-EJB-Appropriate

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