Pros:
Land will be the central Resource point for ALL future games within the Illuvium Universe. This has been specifically stated by Aaron numerous times.
And although at the moment the main resource in use will be FUEL, that does not exclude the possibility that the other resources types produced on the Land cannot also be integrated into the marketplace.
An example might be if an Illuvium themed Space game were to be built in future, it would be likely that the Lands are the ones to build space ports and build the ships for that game.
The team have already hinted at future plans that involve merging lands into mega cities, and the possibility of a clash of clans or other type game system that would be opt in.
Additionally ignoring all of the above, and ONLY basing it on the current confirmed uses of Fuel and Blueprints - the revenue this will generate if the player base gets to 10m will be exceptional!
Cons:
It is NOT a passive income, it requires you to actually play the game, and to get the most efficient resource production from the land, you will need to set your schedule around the cooldown timers to login at regular intervals (including throughout the night) to claim resources and produce more.
If you get busy, or go away with friends, or just have a headache and want to rest, your income generation will reduce or even stop (when max storage is reached).
Additionally this is a mobile game with in app purchases... it will be constantly tempting you to speed something up, to boost the production or to make something easier... but it will cost you.
So you will need to constantly resist that temptation.
My own personal strategy, and not financial advice.
I have ILV staked in the LP pool, and I claim ALL of that as ILV, to be restaked as it unlocks, and will continue to do so for years.
I have bought a substantial amount of sILV2 from secondary markets. Of which I will use 50% to buy Land, 25% to buy Illuvitars, and 25% to be sold back to the Market while the price is high (as a way to offset some of my costs).
Then when Illuvium Overworld launches, 50% of my fuel produced will be sold on market, and 50% will be used in game so that I can maximize my early gameplay, and hopefully catch some rarer Illuvials.
The above strategy is high risk and long return. It focuses more on my gameplay and long term plan to be a large part of the Illuvium Universe.
And it will require a significant amount of play time split between Illuvium Zero and Illuvium Overworld.