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Not that I know off. Transfers are all I can really analyze.

Probably have to build a steem-engine type explorer to read the jsons?

Yes. But it isn’t reliable as anyone can send a Json even without resources. Plus you also have paid In steem which is different.

Hmm, maybe if there was a price list of the upgrades i could do the math in my head.
Did you record the various prices as you went up?

I'm thinking if the value of free upgrades is taken into account it ups the roi?
(A couple of my free buildings were double digits of steem.)
Especially if they become tradeable for folks to cash out.