Yes a lot of people spend frivolously…but in this day and age and in our modern society, internet, a computer, and some type of cell phone (really a smart phone) are really becoming absolute necessities.  

It isn't science.

Per this NY Times article, the average American knows around 600 people.https://www.nytimes.com/2013/02/19/science/the-average-american-knows-how-many-people.html#:~:text=The%20average%20American%20knows%20about,do%20you%20know%20named%20Kevin%3FPer the US Census Bureau, the average American moves 11.7 time in their life, which based upon an approximate lifespan of 84 years, works out to be about every 7 years.https://www.census.gov/topics/population/migration/guidance/calculating-migration-expectancy.html#:~:text=Using%202007%20ACS%20data%2C%20it,one%20move%20per%20single%20yearSo, if the average American knows 600 people and they each move about every 7 years, that means that the average American knows around 85 people that move in any given year.How many of those moves do you want to be involved in?

It is not rocket science, it is basic math.Good luck!

It doesn’t mean a clean house, it means a modern house.

Its' technically legal from what I've been told (check with a lawyer in your state), but there is a pretty precise science involved to make sure you do it all legally and avoid a due-on-sale-clause from the lender which, albeit unlikely, is happening especially in times like now wherein the interest rate difference between current rates and the loan you might be taking over can be significant. 

I like to renovate and rent, harden the properties for longevity and modernity. 

Congratulations, the dismal science of economics holds no sway over you!

It's not rocket science, it's just work. 

Or if you have a nice modern phone, that would probably suffice.