I'd never start or would like to become a pro, but just do my pictures, 99% for my own joy and fun, but like any other human being, and that's a fact - being happy if other people do like my images, besides that, the term "Amateur vs. Pro" couldn't be better described as here (google translation)
... the thing Amateur vs. Professional ... but very nice described online ....
"... An amateur is someone who does something out of love for the cause.
The word amateur comes from the Latin amator, "lover", and "love" from amare.
That you should never forget, because the word is the key to success:
What not to do with love, you will never make really good.
Related to photography means that if the motive that you want to shoot, not "love" - ie,
feels no real interest in him - should one go and pick up the film for better for an opportunity
because the photo just can not be "good".
Here Amateurs have a priceless advantage over the "pros".
Professional photographers earn with photographing their livelihood [...] they are not "free".
In contrast, Amateur photograph only for their own pleasure. When her own master they can do whatever they want ... "
[Andreas Feininger, Richtig Sehen – besser Fotografieren, 1973]