Are old modded consoles worth much?

I work a lot at a normal job then I have a Lil ebay thing where at work I buy the odd computer then turn it into a gaming pc. I make about £30 a computer and probably about 3 computers a month. It does drive me a Lil nuts because my friend keeps trying to get involved, I don't really care about it. 

This guy doesn't work and just buys everything in hope to sell it. He'd get a psp console then slap on custom firmware then show me buy it now prices on ebay then want £50 from me for it. Not just psp consoles but all the old ones like xbox and ps2. I'm just not getting it he is always buying stuff but I can't imagine his actually making any profit on it. 

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