Robert - I know of someone who built an investing simulator that is really good . . . we lost touch for some reason, but I'll see if I can find him.

We're about 75% of the way there, with $1M already working for us.But even though the math all works out and all of the simulations I run seem solidly in my favor, I'm still very concerned about having all of my money in a single basket. 

For Business (in addition to simulations):A semester long project called "Find My Next Investment Property" - which is exactly what it sounds like.

Young James Kirk defeated the "Kobiashi Maru" simulation by altering the software program.

Second way is to simulate doing it - he recommends the game of Monopoly - which was originally designed for business school students.

Hi Jamie, I just wrote a post today on the Bigger Pockets blog that explains how a simul close is done.

This isn't some sort of investment simulation funds to play with on a new brokerage account.

I've seen mortgage inquires have zero affect on borrowers.Shawn hit the nail on the head mortgage inquires during a specific time frame will only count once although they will show each time.Here is a link to thread where I just addressed this.https://www.biggerpockets.com/forums/311/topics/310884-credit-run-buy-unknown-sources-multiple-times For more info I'd suggest checking out myfico.com  This post is 100% correct, especially the part about FICO treating their exact algorithms as a trade secret.Very expensive "FICO simulator" software that we use internally that lets us throw "what if?"

That 25% is to simulate vacancy, maintenance, capex, etc. 

Ryan:When we first created a set of spreadsheets and then wrote a small application to perform some scenario simulations, the BP calculators did not yet exist.