I don't mean to be that guy who says "NERRR READ THE BOOK", but it was explained in the JP:LW book.
Basically, the part of the tour they saw was part of an artifice, and in reality they'd be losing loads of babies. It would have taken so many failed attempts to finally get viable eggs that they needed an entire facility which would be churning out "acceptable losses" until they got it right. A more refined version of the process could be done on the Nublar lab, but still a lot of the real work was going on in Sorna.
(I might have misremembered a bit, but that's the basic idea)
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