I guess people keep paintings because they think they're valuable, either in money or feelings. If it's an original painting and the artist is famous, it could be worth something and might increase in value, so it makes sense to keep it. Also, a painting might have been passed down through the family, making it sentimentally valuable. Some families might even keep a painting that's not very nice to look at, simply because it's been in the family for a long time.
Supongo que las personas conservan pinturas porque creen que son valiosas, ya sea en dinero o sentimientos. Si es una pintura original y el artista es famoso, podría valer algo y podría aumentar su valor, por lo que tiene sentido conservarla. Además, una pintura podría haber sido heredada de la familia, lo que la hace sentimentalmente valiosa. Algunas familias incluso podrían conservar una pintura que no es muy agradable de ver, simplemente porque ha estado en la familia durante mucho tiempo.