In this post, an Incomedia employee gave this answer, see

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Eric C.

Incomedia

Hello Marcio,
the optional objects you have purchased are associated to your account, and the same applies to templates, so if you activate the Agency version on the same account where you have these purchases, they will be available in this version as well.

Eric

>> https://helpcenter.websitex5.com/it/post/266928

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My question was not concerning the objects I have already purchased but will every object available in X5 that I havent already purchased be included in the agency version with nothing else to pay to use them?

Hi Steve, 

the Agency version doesn't include the Optional Objects, I am sorry about that. It does include, however, 50 templates that are usually available on our Marketplace upon payment. 

Thanks! Kind regards.

If you are a website designer for cutomers, you will need to have all objects available to design different websites and different apsects/visuals.

So if you buy the Software + all external objects, the price of the software is a little bit astronomic !
Because interesting options are always into external objects.... $$$$$$$