I have somewhere between 15 and 20 bikes right now but my storeroom at work is so big it's not an issue. At home, I keep one (very clean) road bike in the great room, ready for commuting or a weekend ride, one or two MTBs in the woodshed. The rest are all in my hidey-hole back at work, where most of the wrenching is done anyway. I'm the boss (small hotel, not bike shop, BTW) so it's no problem; other than I really need to get that stuff organized and get rid of a lot of it.

Apart from a really good 29er hardtail MTB and serious touring bike, I don't even *want* any more bikes. But if you pass a garage sale with a minty vintage Waterloo Trek for $30, you are required to buy it, even if its the wrong size for you. It's the law, and you will comply. But since most of what I have on hand is just old junk that I got for free or nearly free, which I fix up to ridable condition, then give away, I'm officially a "Charity Flipper", not a hoarder.

If your wife thinks you're hoarding, maybe you should make little white informational plackcards to post on each bike with the year, country of origin, a brief history etc printed on it. That way, you're not hoarding; you are "curating a collection."