And yes, they charge the guest a higher percentage than me; however, most all of the local PMs also charge a booking fee of some variety if you book through their website, so it's not like that cost goes away or gets rolled into rental rates via a PM.  

What percentage is this?

Using the BP calculators to estimate expenses, I was curious to know what percentages other Columbus, OH investors were using for conservatively estimating management fees, repairs, vacancy, and cap ex.

Revenue: Gross rents then subtract all belowVacancy(5%)-Maintenance-if it's rehabbed this number will likely be close to 0 otherwise, budget another percentage (talk to investors in your area)Property Management 8-10% - CapEx-5% for reserves and big ticket repairsProperty Tax-Insurance-Debt Service (principal and interest) =Net cashflow pre tax

This is normally expressed as a percentage and that percentage is of the ARV.

Percentages lie, and they tell you nothing concrete.  

Then multiply that percentage by monthly rent, that is how much you should budget for Repairs — depends on the age and quality of the house.

If you are planning on buying property on the next dip, what percentage decrease (I.E. 10%, 20% decrease from price highs) would you target for adding to more properties to your portfolio?

Yes true in bad areas there are higher percentage of bad tenants but trust me there are some good ones out there..its just due to their financial status they cant live in good areas.

This percentage is usually a hard number unlike an existing building asking for an addition to go over with an exception?