Here's the perfect app for Steem's current economic model. Does it exist? Maybe in our private Excel spreadsheets that we manually key-in and secretly keep track of. Anyway, it'll surely encourage the accumulation of Steem Power and maybe in the future, V4V tokens as well. The gist of how V4V works:-

I activate V4V on my account.
V4V keeps track of the votes I get from everyone and reciprocates them. So if you vote on my post at X voting power, the V4V app will help me return the same amount of votes on yours automatically. Should require a minimum threshold voting power to trigger V4V.
I can also set multiplier for reciprocation. As a very rough example, if you give me a $1.00 vote, you'd get a $2.00 vote in return if I happen to be setting this multiplier at 2. If I was being much less generous then I'd be setting the multiplier at 0.1, meaning I'd return your $1.00 vote with a $0.10 vote.
V4V will award the best V4Vers with V4V points. Let's say if I always return votes by a multiplier of 10 to my voters over time, I'd get more V4V street cred than usual. But of course, there's nothing stopping anyone from not fulfilling their "V4V promise" by deactivating the app, which is why V4V points can also be penalized over time unless the related accounts not reciprocated are blacklisted by trusted sources and algorithms.
Maybe do the same for witness votes as well. A Lannister always pays his debts.
What are V4V points for? Bragging rights for the most dedicated V4Vers? I dunno, maybe make it an SMT as well in the future then it'll have a purpose or two. Wear V4V like a badge of merit.
V4V + services like https://steemauto.com will become the best voting automation suite. Better reason for accumulating Steem Power for the long-term than solutions like bidbots. Similarly content-agnostic. To the moon!

Note: Seriously though, it could be great addition to the Steem ecosystem and should have real demand, like @danielwong mentioned below.

Shameless plug.

I've recently started running as witness. Announcement post here. Please share it out if you dig it. How to vote:-

Go here: https://steemit.com/~witnesses
Look for @kevinwong and vote.
Alternatively, you can vote through Steemconnect here: https://steemconnect.com/sign/account-witness-vote?witness=kevinwong&approve=1

_{Image from Pexels}

Is there a Vote-for-Vote (V4V) app?

Shameless plug.