Non owners cannot buy these packages because the packages can only be purchased when an owner surveys their land plot. So an owner can purchase these items and use them to make their land more valuable to a renter. I expect that the owners will be the ones building and upgrading the buildings on plots, and renters will be providing the worker cards and harvesting the resources. It wouldn't make sense for a renter to spend resources building/upgrading a building on a plot they don't own and could be taken from them at any time.
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"It wouldn't make sense for a renter to spend resources building/upgrading a building on a plot they don't own and could be taken from them at any time"
That is what happens with guilds, so there is precedent for such "irrational" behaviour....