I’ve sold a few items on Craigslist (spare computer parts, etc), but anything expensive you try to sell will bring out the lowballers. I could probably make several hundred dollars a week, if I had the up front money, travelling around Florida and buying electronics and computers from people who list on Clist for a fraction of what they are worth.
What I’ve bought on Craigslist:
A pair of Klipsch KLF30 speakers in their original boxes and basically brand new for $400. I could have resold them immediately to a Klipsch collector for $1200 on the Klipsch website, but instead decided to keep them and build a home theater from that line of speakers.
A couple of months later, someone listed an Adcom amplifier and tuner for $400.00. The amp would normally sell for 500 or so on Ebay, and the tuner for 150, so I went to check them out. The amp was a 555MKII, and the tuner was never opened(a GTP 400). He basically wanted 300 for the amp and 100 for the tuner. One of the amps channels didnt work however, which he didnt know beforehand. I offered $150 for both, since the amp could have needed a couple hundred bucks in repairs. All it needed was a $2 fuse, and I sold the tuner to a collector for over $200
This past summer, I finally more Klipsch legacy line speakers…a seller in Tampa had a pair of KLF20s (worth around 800-1000 on ebay), a KLF C7 ($350), a pair of SB3s ($150), a B&WASW1000 sub ($250), and a Yamaha 2095 receiver (250) that he was willing to sell for $1000. I drove over, bought it all, sold the receiver and sub which I didnt need for $500.
When it was all said and done, I have a Klipsch Legacy home theater which cost me under $1000 and has an Adcom 200x2 amp. I use the SB3s as DJ monitors. I only need to find an Adcom 200x3 amp and my setup will be complete.
I also found a pair of Technics 1200M3 turntables, a Pioneer mixer, 2 sets of carts/needles, and 100 records for $500 this summer. I was offered $1000 for that setup but I kept it as my new hobby. I see stuff all the time on there that I just don’t have the spare cash or time to go get.