Never. I have two of them. A fat one and the superslim. Once I don't use them anymore, they will look beautiful together with the PS1, PS1 Slim, PS2, PS2 Slim, PSP, N-Gage, NES and so on.
Never sell your consoles. You will regret it sooner or later.
Official member of VGC's Nintendo family, approved by the one and only RolStoppable. I feel honored.