Whether putting art on sale devalues the art and artist is subjective and depends on various factors such as the art's quality, rarity, the artist's reputation, and the market demand.

In some cases, selling art can increase its value, especially if the artist is renowned and the artwork is unique or historical. On the other hand, if an artist produces too many pieces or if their artwork is of low quality, it may lose its value or become less desirable.

Furthermore, the context of the sale can also impact how people perceive the artist and the artwork. If the artwork is sold at a reputable auction house or gallery, it may enhance the artist's reputation and value. In contrast, if the artwork is sold in a discount store or on a mass-market website, it may have the opposite effect.

In a scenario where an artist created a print for a company that is not well known and that company put the print on sale for half off because they were not able to sell it at the original price.

In this case, the artist may be affected by the sale of their print, but it depends on the terms of their agreement with the company. If the artist retained ownership of the artwork and the right to control its distribution and pricing, then the sale by the company without the artist's permission could be a breach of contract or copyright infringement.

However, if the artist granted the company permission to sell the artwork and agreed to a lower price point, then the sale by the company may not affect the artist negatively as long as they received their agreed-upon compensation.

Overall, the impact on the artist's reputation and value depends on various factors such as the quality of the artwork, the artist's reputation, and the perception of the company that is selling the artwork. If the sale of the print reflects poorly on the artist or their work, it could negatively impact their reputation and future sales. However, if the artist has a loyal following and produces high-quality work, their reputation may not be significantly affected by the sale of one print by an unknown company.

In conclusion, while there is no universal answer to whether putting art on sale devalues the art and artist, it depends on various factors such as the art's quality, rarity, the artist's reputation, and the market demand, among other things.