Object.store would make more sense for what you suggest the use would be.
Plus with the .store extension I think it would be difficult to sell this domain.
However there may be a saving grace, there is a wide receiver called Odell Beckham Junior who uses OBJ as his tag. He has recently had a massive deal with Nike so I expect to see branded gear using the OBJ tag. Could be a nice domain for someone selling this line of sportswear.