Figuratively, 旨味 (umami: delicious + flavor) means an “appealing aspect” of a business, which is to say a tasty business proposition. A sample sentence:
その商売はあまり旨味のある商売のようには思えないよ。
Sono shōbai wa amari umami no aru shōbai no yōni wa omoenai yo.
That business doesn’t sound like an appealing one to me.商売 (shōbai: business) trade + to sell
思 (omo(u): to think)