Sounds almost like a good deal only if the rate goes back up on the bitcoin as it stands 1 weeks rental for $65 only profits $2.29 for us per week. 8.05 bit coins every 7 days as long as you have your systems up 24/7 and internet.
if you did less then $65 per week I would be interested. cause i can buy BTC 84.00 and get 10 coins vs 8 and have to see that I made only part of 1 coin after paying you.
$65 per week = 8.05 btc a week  today market value of BTC 8.360 x8.05=  $67.298 - $65 = 2.298 thatch only $2.29 per week.

maybe my math is wrong but buying coins equals more coins and no over head. more profit for the client
so if you where to promise so many coins per week and took just little less I would be interested.

I had similar idea little while ago.