@Chris Parker, my thoughts are similar to @Daniel McNulty, the only reason NOT to buy 100 SFH with strong cash-flow is it's time consuming.

Housing Prices are over-inflated, corporate debt is at an all time high, consumer debt is maxed out (and still out of proportion with corporate debt).

It is hard for a new platform to draw consumers, and I fear that once/ if they do they'll start selling premium features to agents that will more or less make the free version less valuable. 

If the pipes are not yet collapsed they will shoot epoxy in the lines creating a plastic system inside the cast iron.  

Doing it yourself will save around $0.20-$0.40 per letter depending on your consumable costs. 

Consumer Behavior - Especially during this pandemic, people in general have been spending much more time at home.

I'm new to Bigger Pockets however I've been researching, learning and consuming real estate content for 3-4 years now as it's always been an interest for me!

However, we are also in the very early days of some transformative changes in consumer behavior, workplace structure, and housing preferences.

I'm also willing to bet that most of you probably hate it because it's manual, repetitive, and time-consuming. 

More info than you can consume in a lifetime.