It does not encourage you to do more of it when it is solely an obligation. I think eating is a bad example because people eat for pleasure, whereas people only write for utility. People rarely if ever write simply because they enjoy writing. They write to convey or record information, If you remove the utilitarian obligation from writing, and make it solely an exercise in enjoyment, you have to disassociate the obligatory aspect of writing, as well as the functional result. I don't know about you, but I don't really see people transcribing the alphabet 1000 in a notebook for pleasure (or other such trivial applications of writing). When people write, they do it because they have to achieve some end. This is different from fine dining, where there is no end. You don't eat because you need nutrion, but because the meal brings pleasure.
My second assertion was not dismissing the pleasure found in using an expensive pen and feeling good, but merely an explanation of why I think it's silly. If one cares about having profligate writing instruments, more power to them. I, however, just want something that works well. In a pen, that is usually determined by the insert, which is why a $60 shell isn't important.