Remember that 9% reward does not come from the skies 
9% in rewards could be reached only with something around 5% - 8% inflation on the total supply, which would:
- Make anyone not participating in the staking pretty mad
- Create too steep inflation curve for the first years
Staking profit size is a complex equilibrium between a reward, a punishment, and a monetary policy. Rewards will be bigger than inflation, when platform gets popular and attracts a lot of transactions. And IOHK does a lot of interesting stuff, to attract programming transactions on the platform, and that is, imo, the best solution. Attracting lots of people with over-profitable staking on a programming platform would be like trying to to encourage people to open car-repairing shops, while also paying people for keeping their cars at home and never riding them
Staking is targeted toward all the wails that HODL the coin anyways. And let’s not forget that these 2-3 percent profits will be in a deflationary currency.
P.S. Staking reward size does not really matter, btw. Only the boolean fact - whether you are staking or not will matter, since people who are staking for the first years will basically stay with the same amount of value (if coin price does not change), and people who aren’t staking will get inflated, and will end up with lower value, even with the same amount of coins.
P.P.S. Btw, there’s a new calculator