wouldnt say a scam at all, and i dont think they will be "Leggy" or poor condition either, they are likely to be good spec and good condition, the price reflects what realistically they are worth.
I predicted the 6K Boxster just over 18 months ago - only i said within three years they will be going for 6K.
Lets be honest - times are tough
credit crunch
unemployment
rising insurrance
Massive hike in fuel prices (though a temporary lull at the moment)
Car tax next year
The Porsche common faults - alarms, roof, creaks ratles, water ingress, self lowering windows, oil leaks, brake discs, CELs, AOS, wheel bearings, gearchange
The crap OPCs
Parts prices
An 11 year old car selling for 6K is still very good - indeed you can purchase a normal small family car almost new for this and something like a KIA with a 7 year warranty must be attractive to small car buyers.
The 6K market will satisfy the boy racers and those that always wanted a Porsche but couldnt quite justify the outlay.
All things considered i dont think its a bad thing there is a market to pass these cars on to, after all most 3 year old Porsches have had two or three owners, personally i dont know why they dont keep them longer - but perhaps that is one reason Porsche dont need to give any more than a two year warranty as the original owner will have passed it on long before warranty runs out, more money than sense?