When there's too much of anything, it no longer holds it's value. This applies to things such as food, art and even weddings. Whether religious or not, a marriage is the joining of two people that are truly in love and see themselves with their partner for the rest of their lives. When somebody tells the world they're getting married and makes a huge deal of it, and then divorces a few weeks later, that tends to hurt the foundation of marriage. Why take it serious anymore? Art is no different. We live in a world that's flooded with "art". I must use quotations because, let's be honest, not everyone has had the same amount of art experience as others. Cafes, lounges and even restaurants are often crowded with photography, paintings or any other incarnation of "art", usually supplied by local artists. This is where it becomes vital that these artists realize that even if they make the $150 or $250 they have listed next to their work, they're doing themselves and every other artist a disservice.
Allowing a business to show your work seems like a win-win situation, but it's not. Consider that a museum or gallery will show your work at the ideal viewing height, with optimal lighting and bring in crowds of people that are only interested in art. Restaurants and cafes only care about selling their goods and services. And the patrons? Rarely does anyone that enters a T.G.I.Fridays with a hankering for the Caribbean Passion Tossed Salad ever say, "You know, I came to T.G.I.Fridays because they have good prices, but I really want to spend this $250 I have in my wallet on that painting that makes absolutely no sense." If it does, I owe you a Coke.