Hola @nelyp, mi español no bien todavia, quizá más tarde. Luckily there's Google translator which did surprisingly good job with translating your text😁

On the other hand it's amazing that someone does such art that is available for everyone to look at, instead of hiding it behind closed walls, but I do agree that getting only pennies for such effort seems unfair. Though great art can't be made only with the incentive of money.

Recently here in Finland there was an international market and there was also this graffiti street painter who did speed paintings, you can find some pictures of it here. Didn't dare to buy any of his work, but I did give the few spares, felt like I had to give him a little of my support.