That could potentially take away all the extra from increasing $150 for several years.

Otherwise, you won't have the extra funds necessary to cover the rising costs of goods and services in the future.What causes rents (and prices) to increase?

A neat feature with xfinity (no I don’t work there 😀) is the voice remote and once you have one box you can stream the service to the rest of your TVs cutting down the cost of extra cable drops. 

It may sound nice to pay a 6% management fee but the extra fees can add up to be more than the other company that charges 10% with no additional fees.

The reality is the opposite - if it's not in writing then the PMC doesn't have to provide the service or can charge extra for it!

I also agree that RE appreciation is unlikely to match the last dozen years, but you never know.Where I am unsure we agree is that paying $450k to improve the cash flow ~$3k (your numbers but I expect my delta wold be similar meaning both my cash flow estimates would be worse than yours but both would be worse by the same amount not affecting the difference) makes sense especially if the cost of having the extra $450k is only 6% rate which is historically simple to beat via numerous investment options and hopefully no one is investing in RE for an expected of 6%.  

I'm struggling to generate extra lead flow from builders, mostly because it's so difficult to identify folks that are doing ground up, business purpose construction. 

3) It's been 5+ years since we've seen a S8 tenant lose their voucher for property damages, not paying their portion of the rent or utilities, or other lease violations (letting others move in with them).It's our opinion that #2 & #3 above are caused by overworked caseworkers not having the time to process the extra required paperwork, so they take the path of least resistance.4) S8 needs someone at the federal level to put more of the program online and streamline the process!

Is it worth to invest and learn from their program in order to start my co-hosing STR side business just to get some extra money monthly?

I do not see a need for extra cost or tech not all of your guests will appreciate (i.e. older generations).