Know its a total waste of money but would and do buy used bits of
Ebay just because they are either nice names or good looking just to add some bling to my bikes, ie, dura ace chainsets, chromag saddles, Ritchey bars and stems to name but a few.
Know i do spend quite a bit an example, bought a used (less than 300 miles from new) caad 8 Claris, within about 2 months, it had fitted new larger tyres, 105 groupset, better bars and stem, pedals saddlebag and mini pump.
Know its time and money wasted but along with cycling thats my hobby, so yes costs money but better than drinking, smoking or gambling it away?