Sports gear is practical to sell and practical to get wrong, usually in the delivery.
Not checking length pricing
Couriers price on length as well as weight, and bats, bags and barbells attract surcharges or refusals. Find out before you quote. How delivery is charged.
Not giving the specification
Bat size and weight, racket grip size, shoe size measured inside, plate bore diameter. These decide whether a buyer can use the thing at all.
Not naming the model and year
Equipment moves in model years, and a good two-year-old model at a sensible price is invisible if the listing does not name it.
Not showing the working part
The face of a bat, the frame of a racket, the sole of a shoe, the bearings in anything that turns.
Hiding a crack
A cracked frame is a dead racket and a structurally damaged bat is a parts item. Sold as sound, either is a return.
Not saying when a racket was last strung
Tension drops with time and buyers know it. A fresh string job is worth real money if you say so.
Posting shoes in their own shoe box
Box inside a box, toes stuffed. Packing sneakers applies.
The one that costs most
Not cleaning it. Nobody wants somebody else's season in a parcel, and it is the complaint that sounds smallest and lands hardest.
Questions people ask
Should I restring before selling?
Usually yes for rackets, saying so and saying with what.
Is children's gear worth listing?
Yes, and it moves fast in size lots.
Can I sell untested gym equipment?
Say untested and price it so. Weigh it before quoting.