There are real costs that new investors don't know and get tripped up.The biggest mistake I see new investors make is making offers on deals that no seller in their right mind would accept. 

1) A down payment up front of $15-$30k per property (or whatever they can afford that you’d accept). 2) Rent (not applied towards purchase) - covers your mortgage, but no more maintenance or management fees, etc. 3) A windfall of the balance of the purchase price at the end of the term.Bonus: if they want, they can apply additional funds towards the balance of the purchase price on top of rent. 

Often what they ask for is not what is always required... it likely says something like "Verify the duration the entity has been in business" and someone decided "A letter from a CPA would be acceptable and easy".  

Additionally, be aware of any specific requirements or regulations related to accepting vouchers in your area.

Hi Kayla,If the seller accepts your offer then the offer is contingent.

Same reason why an agent may push a seller into accepting $10k less on an offer, it gets the house sold and the difference is only $300 to them (based on 3% commission), whereas it's $9,700 to the seller. 

For example, I mention that every adult must pay a $30 application fee, pass my credit/criminal background, make a combined income of 3x the rent, and whether or not the property accepts pets.

Most lenders will only accept properties C3 or better. 

Are you willing to accept that?

using the bank to agree to a set amount of stock that they will accept as adequate and that negates the wide swings you talk of.