Isn't the possibility to allocate funds itself already a big enough incentive to vote? Currently with many big accounts not using their voting power, effectively you get nearly twice your money to distribute to good content of your choice. What do you want more?

Currently many people are just voting to get the curation reward, not because they necessarily like to support the post. Also the curation reward algorithm is so complex, that not many will understand it.

We could give the saved money from the curation reward to fully verified accounts. This would help greatly to encourage newcomers to participate at steemit. More on how this could look like please see my other comment below.