As a buyer I would be quite hesitate to buy from a casual seller

I don't consider everyone without a store as a casual seller, sure some are but there are some sellers out there who only list about 7 or 8 items a week but have been doing so for years and have good feedback as a seller.

Some sellers only have items in the shearing season so they have no need for a store but have along history of selling great fleeces.

So it is possible to have total trust in a seller even if they don't have a store.

However with $30,000 of stock I would open a store asap and start selling.