@Robert Wentland,I would also start attending local REI meetings if you aren't already. 

If you are listing it online, aren't you just in a sense just "listing it on market"? 

If you aren't getting traction, then it is either the price or the marketing.

Big enough that you aren't competing with newer investors/house hackers but small enough that you aren't competing with institutional money.

That's fine as between them but the lender is still going to hold both liable for the debt if the payments aren't made. 

Profits aren't somehow ridiculously high, but our average cash on cash return is >23% across the portfolio.  

Given the size of the transactions generally offered on crowdfunding sites, there aren’t enough secondary trades large enough to make the economics work systematically (besides the regulatory constraints) for Broker/Dealers to be incentivized to help LPs to redeem their positions via a sale/transfer to a new investor before the end of the investment period. 

As long as it is your primary residence and you aren't renting it out when you are not there, you will be fine.

My rule of thumb is, if you have to ask if they are legit then they probably aren't.

First off, you should know that getting a loan as a foreigner in Mexico is quite difficult—most traditional lending options aren’t available, so you’ll likely have to explore alternative financing or fund the construction yourself.When it comes to managing the property as a short-term rental, you'll need to decide whether you want to open a small company in Mexico.