I looked into them briefly for a unit that I was considering a traditional STR until next July and then 30+ day rental after that (when San Diego's STR quota goes into effect). 

Is anyone else engaged in this sector?

While the current lifetime exemption is approx $ 11.7M, this is set to be cut in half effective 1/1/26, and that reduction may further be accelerated if tax legislation gets passed.

If it's a basically functional and complete home, and you will have a bunch of equity, a cash out refi or HELOC would be significantly more cost effective (rates/fees) and easy (paperwork, back and forth, closing time, etc) than a renovation loan. 

What do you feel is a 'good' ratio of home owners to tenants, and how does this statistic really effect a certain area?

Can someone explain why this effected the US stock market as much as it did please

This can be way more cost effective than calling a smoke and fire restoration contractor that is used to just trying to max out the insurance. 

Here is a quote I heard from Hal Elrod “Your level of success will rarely exceed your level of personal development because success is something that you attract by the person you become”Here is my list of the top books that have made the greatest impact on me so far, and I would like to recommend:The Miracle Morning by Hal ElrodThe Book on Rental Property Investing by Brandon TurnerThe Book on Managing Rental Properties by Brandon and Heather TurnerRich Dad Poor Dad by Robert KiyosakiThe Compound Effect by Darren HardyBuy Rent Rehab Refinance Repeat by David GreeneMaxout your Life by Ed MylettThe Book on Tax Strategies by Amanda HanThe Five Love Languages by Gary ChapmanThe Ultimate Self-Directed IRA by Jeff AstorEnjoy, learn, and most importantly take action!!

The only reason to let them in is to keep them engaged if they truly love the place. 

We do ours quarterly; it's a good way to engage with your tenants a little bit too.