Oil painting when i was student 10 years ago - Now sold for 400 euros

Oil painting when i was student 10 years ago - Now sold for 400 euros.
At that momment i was a designer and i liked that kind of works, then.. But now after 10 years i just sold them for 400 euros.
it can be good business for paint artists. Maybe its not a best business, but for some peoples it helps to relax.