For those of you who've had similar options, what kind of difference do you look for from mathematical perspective in order to decide whether to sell or rent?

Even though someone knows what they should do mathematically, doesn't mean that decision is supported emotionally.  

A lot of bad deals can be avoided by doing simple proven mathematics instead of guessing or listening to other people’s estimates .

I was a Secondary Mathematics Education Major before I dropped out.

I just finished up my bachelors in mathematics and would love to try my hand at working for a firm.

Give me a mathematical reason why it is 70, why not 72.5 hell why not 61%?

You are fishing for that exception.I am giving mathematical proof of my claims. 3% success rate doesn't "work". .. but NO ONE addresses this.

From mathematical formula:Here's the first month ratio from amortization table for the first month for principal and interest rate paymentfor loan of $100k:CP:cum. principal LB=loan balance.Interest rate of 3%interest/principal$250:$171 ratio principal to interest : 40%,first principal $177,when is CP>LB=month 2205%415:120 ratio principal to interest : 22%6%500:99 ratio principal to interest : 16%7.5% i:p 100k625:75 ratio principal to interest:10% , CP>LB month 2208.5%708:60 ratio principal to interest 7%7.5% i:p 100k with additional principal of $177 every month625:75 ratio principal to interest:10% , CP>LB month 128Result:-Interest rate of 7.5% and 8.5% doesn't make much difference in equity building(diff only 3%), except if you could have interest rate of 3-4%- What you should do is simple, just go with interest rate that doesn't require you to add anything upfront.- if you add $177 principal payment for every $100k, your equity building is actually faster than 3% without additional principal payment.

You need to pick a DIFFERENT marketing strategy to increase that number.Do you start to see how I mathematically have proven  that DMM, Cold Calling, Text messaging.. anything to do with a list simply doesn't work when it comes to mathematical standards?

I graduated from the University of Houston with a degree in mathematics (mostly out of love for the subject) not really knowing what I wanted in life.