High return of profit? That sounds like some of the lines these Ponzi schemes uses, that is, most platforms which offers high return on investment with little capital always ends up being Ponzi schemes. Nevertheless, I have not heard of the Bitcoin Vault before, from the name, it sounds like a vault where Bitcoin is stored (sounds funny though) could be its use case. However, no matter what you heard about the project, make sure you are armed with the neccessary information before investing, because scammers can easily create a scam project, attach Bitcoin to the name to attract more people.