then you may be happy. Because from my average land value and 90k people I got around 170k high value land just by "not required services" (transportation/education). And having 20% in both cases, tax revenue rised from like 11.6k to 13.3k. That's not what I call "crutial" or "important". It's negligible. Especially when one considers the price of services.
If every sim generated certain amount of money it would be worth investing into expensive buildings.
But so far you actually get most value on low levels. As tasks are simple there and production capacities can easily fulfill them. As you level up you only get more expenses while you are still limited by the very same single hardware shop and your taxes won't rise to make it worth 🙂