Yes. ASSETs can be purchased from The Sandbox's marketplace.
Yes, you will need $SAND to purchase ASSETs from The Sandbox's marketplace. $SAND is the currency of The Sandbox's platform, it will be required for all purchases in the metaverse.
The price of ASSETs on the marketplace is up to the creator of that ASSET.
They would need to price their ASSET fairly based on quality, uniqueness, GEMs and scarcity, for example.
Yes, you can sell these ASSETs on The Sandbox's marketplace if you wish.
The price of any ASSETs on the marketplace are entirely up to the creator of that ASSET. However, they will need to remain fair and competitive in order to attract buyers. Some things to take into account when pricing ASSETs are the quality of the ASSET's design (including small details), the quality of any animations, the scarcity of the ASSET, its GEMS and CATALYSTs and its uniqueness.
There is a small fee for artists to upload their ASSETs to the marketplace. This is to ensure that the uploader is a serious and genuine seller.
There is a small 5% fee on all $SAND transactions that occur within The Sandbox's marketplace. This fee goes into the Foundation fund, which is used to fund great projects, artists and game designers in the metaverse.
The Sandbox cannot offer you any tax advice. Taxation rules differ by nation and even by counties or states. Please seek advice from an official tax representative in your local jurisdiction.