Its because you dont seem to get stickers with the parts you buy these days. BITD, I plastered my bikes with the 'upgrade' stickers, blue Shimano decals, Zoom decals, Ritchey decals etc etc.
For a teenage replica, round here would have been a yellow Claud Butler with 501 tubing or a Raleigh Yukon - then plaster it in MBUK stickers and upgrade sticker