With the stuff you sell you should look into getting a Square card reader for your phone. The fees are less than PP. I have great luck selling on CL and swap meets when I can take a CC. It is hard to sell $1000+ stuff for cash. On weekends people can't pull that much out of the bank even if they have it and want to.I honestly have better luck selling my stuff over craigslist then Talkbass , example is I sold a 1978 P bass for $1500 cash on craiglist, on TB I got zero offers and it was up nearly a month and I was asking $1600 shipped well after paypal fees and shipping I would have netted like $1450, less money and more time spent boxing it up and driving to the post office. That said I am in LA so I have a bigger audience on craigslist then most and additionally I have had a American standard jazz bass, all original with original case on craigslist a few months at $700 and its still there which I think is basically a bargain price. Its tough to move stuff, even tougher here.
I always put in my ads I can take CC's but prefer cash.
I never haggle when taking a CC ether.
When I sell on CL I figure the best price I could get moving it here, then subtract the PP fees and shipping and list it for that.