Yes. Why not? I like it.
In fact, @qurator works in a similar way. You have to pay a subscription and they will upvote you. You also have the option of delegating steem power and you will receive a better upvote. The big difference is that they only ask for a unique payment... then there is not much funding.
Yes, I am familiar with qurator and I view it as one of the premier Subscription Bots that has emerged.
They rely on Delegations and Upvotes for ongoing funding. The unique payment is for purchasing membership.