Yeah, you earn the YFV token, which covers the impermanent loss, if any, on the Balancer contracts. You also earn vETH and vUSD in addition to the YFV.

What is nice about the Balancer contracts is that the weights can be other than 50%/50%, which is especially great for riskier token contracts.

So one can actually provide liquidity in a 49% RenBTC/ 49% wBTC/ 2% YFV contract, or something with ETH or Stablecoins.