I recommend being into bikes because you love riding them and want the exercise, and to never own one or any parts that are worth selling, just giving away to others who may need them. If I meet a cycliist and they can not talk about bicycles without also talking about money, then I don't consider them to be really interested in bicycles, but just using them to make money or as jewelry. There are lots of dirt-cheap old bicycles to ride out there, really competent and practical ones too that can be had for nothing or pocket-change. Those are the ones I like to ride, for exercise, fun and to show people they don't have to buy the overpriced carbon/plastic crap that is being sold today, there is no reason for it.