Investing in retrobikes is like investing a warm jacket. You don't go into it to see a financial return, but may still benefit hugely.
With retrobikes, there is a likelihood that as we age out ie hit our 60s/70s the value will decrease as there will be fewer collectors who were there/adding to their collection and some will want to liquidate their collection to fund their retirement (or their relatives will after their death). It's possible, however, that bike companies/media etc may inject new interest via nostalgia based marketing. That could happen at any point.
Some iconic/rare bikes may continue to increase in value throughout. For a long term view, ask yourself how much the average mass produced bike from the 40s/50s is worth? I've found old rod brake bikes simply dumped on the street, ridden them for a few months and left them out for the next person to ride. A few of the nicer examples sit in museums/collections - but suspect demand is relatively low.
With retrobikes, there is a likelihood that as we age out ie hit our 60s/70s the value will decrease as there will be fewer collectors who were there/adding to their collection and some will want to liquidate their collection to fund their retirement (or their relatives will after their death). It's possible, however, that bike companies/media etc may inject new interest via nostalgia based marketing. That could happen at any point.
Some iconic/rare bikes may continue to increase in value throughout. For a long term view, ask yourself how much the average mass produced bike from the 40s/50s is worth? I've found old rod brake bikes simply dumped on the street, ridden them for a few months and left them out for the next person to ride. A few of the nicer examples sit in museums/collections - but suspect demand is relatively low.