I've bought seven basses in the last few years without playing them. Four of them were cheapies that I got to fix up (two SX, a Danelectro 63 on clearance, and a low-level Dean). Two I still have and two I decided I didn't really care for. While I took some loss on them, the total dollar amount was pretty low and not out of line for the experience I had with them.
The other three were basses that were uncommon and pretty much the only way to get them was to buy them on-line. One of them became one of my favorite go-to basses (Gibson Les Paul Money Bass); one of them is more a collectible than a player so while it's not my favorite that's not really why I bought it (Acoustic/Mosrite Black Widow); and the other I just never really connected with (Carvin LB60, bought because it was solid koa and just looked so pretty).
Having done all that, I don't think I will be doing that much anymore. I have several basses I really like that will work well for just about any of the basic pop/rock shows I'm likely to be playing any time soon, so just being curious about a bass is really not enough of a justification to buy one anymore. I'm sure I'll get more basses over the rest of my life, but they will be basses that I've played and that really speak to me when I hold them. That's the best reason to buy another bass, and you can never get that buying on-line.