I don't think there's anyone on the planet who could honestly say "I need to own three breast pumps." Nor can I say this, but that doesn't change the fact that I own three breast pumps.
The first one was bought from Target for about $150. It was all they had and I thought it was all I needed. When the baby was a couple of days old I needed it and it lasted a few days before the motor stopped working. Before you start thinking "She should have bought a Medela. That's the only brand that lasts" you should know that it was a Medela, smarty pants. This particular Medela however, was not a daily use pump which is what I really needed, and since the motor had stopped working I took it back to Target. As my luck would have it, this particular pump had been clearanced out at about $30 which was too big of a loss for my taste so I took it back home with me and called Medela. After about 30 minutes of troubleshooting with the nice customer service rep, she told me it's possible the water we ran through the motor (not what I would've expected them to tell me to do) will get it working in a couple of days, but she'd send me a new motor anyway.
Two days later the new motor arrived, just hours after I'd tried the old pump again and found that it was now working.
I now had two motors for a non-daily use pump which just wasn't going to cut it when I went back to work. Hence, we bought a new daily-use pump for about $250. That makes three, folks.
I've thought about selling the old motor(s) on ebay. Not the individual pieces (shields, bottles etc.), which are sold separately and really should be purchased new, and I've found that you can never have enough of them so I'm keeping them. I'm not convinced I'll ever actually follow through with selling these pumps though because I was dead set on selling my wedding dress because I'll never need it again so why keep it? but over 2 years later it's still in my closet. Ask me in 2 years, and those two motors will still probably be in the closet, right next to the wedding dress.