4 years in mining terms is a lifetime.
renewable contracts every 6 months, and you might have a winning proposal.
If I were to offer something like that, what do you think the price should look like? reasonably speaking?
The reason why I offered the 4 year share, is because when I researched competitors to create my model, I noticed that mining contractors where charging people for the hardware and for future hardware. In extreme cases they even charge their customers for making a profit.
As I reviewed the different models it seemed to me that the best way to insure that my customers could produce a profit would be to treat them as if I was selling them a physical piece of hardware. Where the profits are their own.
1 GH/s isn't going to produce a profit for 4 years.
But because it is prorated with a minimum number of years, it is almost like I'm selling hardware that grows and comes with a 4 year warranty.
As opposed to renew contracts, customers would purchase more shares every so often if it remained profitable. I plan to increase the minimum share hashing power every 6 months at a minimum which I think will help to keep up with difficulty.
But obviously, if that's not popular I can rework the numbers and see what I can do.
Such as offer more GH/s for a short but fixed period as you seem to suggest.