If the software is not simplifying your life or making you more accurate, you shouldn't use it.

Believing that BPOs are all accurate at to market value10.

My house trippled in value in 15 years and one of my condos doubled in the first 5 yet I still would have been better off investing in the S&P in a like for like scenario for which I gave an accurate break down using multiple online calculators against my own properties at present time. 

Check that your marketing is casting a wide net, the information is accurate, pictures are well-lit and at good angles, etc.3.

People say RE investing is ONLY about numbers, but in reality that's just not accurate in my opinion. 

Exactly how accurate is there forecasting track record?

@Vinay M.Recommend exploring as many sources as possible to get referrals AND cross-reference them to get as much accurate information as possible.Check out NARPM.com, BP’s Property Manager Finder, etc.Also, encourage you to learn from the mistakes of others - by reading posts here on BiggerPockets about owners not having their expectations met by their current Property Management Company.

The way they aggregate rents is not very accurate.

If you can consistently source good deals, your numbers are accurate, and you're straightforward with people, you're absolutely golden. 

I do know houses and I can assess their value easily(and pretty accurately).Gained equity - Above and beyond cash flow, someone else is making payments that build equity for you.Risk mitigation - There is actually less risk as far as unknowns when you have more houses.