Information on Hosting An Open House for Realtor

[Grace Porritt]

Does anyone know if a real estate license is required to host an open house for a Realtor?  Are there any rules for accepting compensation?  I am considering starting a business to assist realtors with their open houses....many realtors hate to do this.  I have lots of sales and marketing experience.

For any of you that are realtors....

What would you pay for a service like this?  
Would you pay additional for a "close" that resulted from this service? (Is that allowed?)
Would you pay extra for leads that turned in to clients? (Is this allowed)
What makes a GREAT open house in your opinion?