I think this is a new service and has potential. All the conditions you offer looks good. However, only 2 things I feel you need to discuss thoroughly .

Firstly , there is the issue of safe deposits of 0.35 BTC . If you must deposit 0.35 BTC, rather that buy accounts Sr. Member in the market

(even buy 2 acc Sr Member).

Second, if the lease term that happen the account is banned, it will solve like? What compensation?

I think it was two issues need to be considered carefully