So is the "Your rate" amount used to convert USD -> btc and btc -> USD, or does it use the market rate to go one way?
Our service doesn't currently allow USD->BTC conversion. It is fully capable of doing so, but we're still reviewing the legal implications. Here is a scenario that explains the different rates:
Bitmunchies.com draws the BTCinch Retail rate from the BTCinch server, and sets its internal conversion rate.
Customer checks out on Bitmunchies.com, paying 1BTC at the retail rate.
Bitmunchies.com converts the 1BTC at BTCinch Business rate (this would be their 'your rate' in the dashboard)
BTCinch.com keeps the difference (~1%)