Wish Native Packager: Mac Hosted Builder?

I'm wondering that since there's the B4i Hosted Builder, why not provide a B4J Hosted Builder that builds native packages for Mac using the App Packager? (This would be great for those who don't have access to a mac.)

Technically it is possible. However I'm not sure that it will be too useful as you must test your app on a Mac if you want to distribute a Mac app.
(And it cannot be a free product as the Mac builders will be quickly flooded so such a feature will have quite a lot overhead).

Erel said:

However I'm not sure that it will be too useful as you must test your app on a Mac if you want to distribute a Mac app

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Two points:
1: That's only true if you use platform specific code. (The whole point of Java is to allow devs to write once and deploy anywhere.)
2: There are communities (such as /r/betatests) where you can post apps to be tested.

Erel said:

And it cannot be a free product

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I would have no problem with paying for it.
Maybe it could even have the ability to upload apps to the Mac App Store.