As for the Trade in on the GTI at vw some manufacturers actually give a incentive to trade up in the same family which could also explain the higher offer.
Land rover and Merc definitely did it or might even still be doing it.
Unfortunately Alfa especially our friends at Arnold do not want to give good trade ins on Alfas. They offered a clients wife R35 000 for her perfect 2001 spider when she wanted to trade it in on a Mito.
Her husband gave her the money for the Spider instead, so now she drives a Mito and he drives the Spider.
GTV V6 Turbo, Q2, Eibach, Koni, and lots more
916 2.0 Spider what have I done
Triumph Trophy 1200 to counter the fuel prices.