yeah, but you have 4 whole vehicles you don't have to fuel or insure, and the parts are way less! Also way less stress than driving!

I think the key is getting used bikes- they don't depreciate that much if you don't buy them new, and sometimes you find stupid good deals. I got my Dutch cargo bike for $475! That's, like, a few tanks of gas and it's saved far more than that by carrying things I would have otherwise had to use a car for. It's when you start adding in the fancy custom bikes it gets shockingly expensive, but at least they're way cooler!

Sometimes people are floored when I tell them how much my custom bike cost (or any decent higher end bike, really) and they're all "my first car cost that much!". I always want to reply with "so you're saying you bought a brand new car, designed specifically for your exact measurements, painstakingly and individually crafted by a master metalworker, with the best components in the industry, and you never have to put extra money in it just to keep it on the road, for $4,000 total? Or you bought a used crapbox of a car that you actually spent much, much more on and you think it's rational to compare it to my really fancy bicycle". If I were you I'd be all "yes! More space and cash for bikes!"