Пошел за большим, не жалей малого

It is worth sacrificing a little to gain much

Cf: Не that would catch a fish must venture his bait (Am.). A hook's well lost to catch a salmon (Am., Br.). Risk Set) a sprat to catch a whale (Am.). Throw out a sprat to catch a herring (a mackerel, a whale) (Br.). Venture a small fish to catch a great one (Am., Br.). You must lose a fly to catch a trout (Am., Br.)