I've read here a little: https://hackernoon.com/what-is-blockchain-as-a-service-28667754d6dc
Imho this could be an option for companies that need private blockchains for their use, where decentralization is not necessary.
But a good mention is that it's a buzz. Be aware that after all blockchain is "just" a database and not all projects need this kind of database.

So the answer to the question "woes it worth to use" this.. depends a lot on what you want to use it for.