THe owns a garage wall, which Banksy's latest mural appeared last month, saying he is struggling to cope with the pressure of being responsible for such a valuable "art tax".
The work appeared on the side of the car garage in Taibach, Port Talbot last year, and thousands of artist's fans have since flocked to the site.
Ian Lewis, 55, who owns the garage, said it had left him feeling "stressed" and demanding some normality.
"It has only been so much for me. I actually manage an artistic impulse by myself," he told BBC Wales.
"There are over a thousand people going there one day, all hours, day and night. I can't do it now, to be honest with you."
Mr Lewis said it was only thanks to the entrance to Port Talbot's native Michael Sheen, the actor, who offered to pay for security over Christmas, that he did not lose art through vandalism or theft.
"I didn't know at first that it was a Banksy, I just thought it was a wonderful piece of artwork, and I was going to cover it and protect it and keep it to myself," he added.