You would have to be significantly cheaper than my current cleaners for me to give you a shot, because I generally have only changed cleaners for either consistent subpar work or increasing/unreasonable prices.

The market is crazy right now and will be for the next 2 to 3 yearsdue to inflation devaluing the dollar, inflation increasing newbuilding costs.

I've been gradually increasing rent.

Other most common factor: Family Size increases due to marriage or having a child. 

The property has a 3 car garage that could be rented to tenants to increase ROI. 

This will increase the likelihood of getting references of other off market deals from both of them in the future.

That way they keep their licenses and ratings.I don't see much of a difference really.Don't keep them out as they will get increasingly suspicious and they might pull your permit for non-compliance.

This is a very valuable skillset to have in your arsenal as an investor that can dramatically increase your net worth in a short period of time if the strategy is applied correctly.  

Increase your earnings, reduce expenses, save up, and invest.

Yeap, exactly same as Zillow's Zestimate increased the price of houses.