Surprisingly most zoning in the US didn't come into effect until the 1950's and most lots in developed areas were created before this.  

Most come out ahead over an extended period of time by buying better quality assets where they perhaps have to leave some capital in the property but find themselves able to sell for real gains or refinance out appreciated equity and scale more effectively that way. 

Also, your total returns go down without any leverage because you lose the multiplier effect of appreciation.Now, to answer your question.

Tons of double sided tape used which results in a fair amount of extra effort to restore (most cases paint comes right off the wall requiring patching sanding etc, some cases Good-off was effective.

Rather than tearing down everyone, I’d rather focus on how different teaching styles and strategies might suit different investors' needs.When someone consistently promotes one product while criticizing others they haven't tried, it undermines the trust and authenticity that makes this forum valuable.I'm not trying to create conflict here, but as someone who has learned a lot from different educators in the land investing space, it is concerning when I see someone posting carefully disguised spam and trying to make it look like an unbiased review. 

It is better suited to someone who loves Costa Rica and would like a property that they can spend a few months a year at if they would like and still cash flow after all maintenance and utilities and taxes.  

Here is the source for the commission rate, right from the Sitzler NAR lawsuit judgement (bold text added):"In addition to training, Plaintiffs have presented expert testimony showing that Section 2-G-1 had the effect of stabilizing commission rates.

Also, check to see if your jurisdiction is practicing "Just Cause Eviction", which went into effect statewide earlier this year for municipalities that which to opt in. 

@Chris Kay finding a quality, cost-effective contractor is extremely difficult:(There are thousands of contractors that are great talkers, but rarely perform within budget.Standard bait & switch is to lowball a bid, then once they get started all sorts of things "pop up" that somehow their bid didn't cover.

I am a strong advocate for their effectiveness allowing you to do substantially more with your money.