A. Renting hash to point at your node is a bad idea. Throwing $$ at your private node is insane... Do you have redundant infra and connections to the 'net to broadcast Block Found info to the multiple sites around the world that well run pools use? Odds are - no. I would NEVER risk losing a block in an orphan race against better connected pools like that...

 B. Most hash rentals require an initial connection minimum diff of 1,000,000 to run due to the size of the 'mega-miner' they are providing.