Is This Even Legal To Sell Stamp Reproductions/Copies?

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Uncanceled (unused) United States and Foreign Postage Stamps

Illegal: Full color, full size, copies of uncanceled United States and foreign postage stamps
Legal: Black and white copies of uncanceled United States and foreign postage stamps in any size.
Full color copies of uncanceled United States and foreign postage stamps must be less than three-fourths or more than one and one-half times the size of the genuine stamp. After the reproduction is complete, the things used to make it, such as photographs, computer files, photographic negatives and digital media, must be destroyed or erased.

Canceled (used) United States and Foreign Postage Stamps

Illegal: Canceled United States and foreign postage stamps of any size, color or black and white, without an official cancellation mark
Legal: Canceled United States and foreign postage stamps of any size, color or black and white, bearing an official cancellation mark, i.e., the stamps must have been used for postage. After the reproduction is complete, the things used to make it, such as photographs, computer files, photographic negatives and digital media, must be destroyed or erased.

Revenue Stamps

Illegal: Printed copies of United States and foreign revenue stamps in color at any size.
Legal: Printed copies of United States and foreign revenue stamps in black and white at any size. After the reproduction is complete, the things used to make it, such as photographs, computer files, photographic negatives and digital media, must be destroyed or erased.