Smart business strategy. By allowing us to take a portion of your profits from your overflow, you keep your customers happy and hooked to you, allowing you to grow your own investment.
Out of curiosity, about how many BTC/day is your demand exceeding your capacity right now?
Currently I've got one order scheduled for tomorrow (1750BTC) and have it covered, but i'll know the next purchase when I meet with them. In the past they've asked for transactions as large as 3000BTC but have not been able to give them an estimate on timing until now. So far with the people I've picked up it looks like this is going to work out perfectly.
Edit: Just ran some quick numbers and looks like im trading around 4900BTC a week.