What are you hitting them with?😱
Mine are over 10 years old, get moved from bivvy to bivvy each time I buy a new one. I am very careful to not lose them, if one gets blown out, I go searching, but have spares, from each new bivvy I get.
I have never needed to hammer a bivvy peg in, even in the ground the brolly is on in the pic. By screwing the pegs in by hand they held, and I have fished that swim a few times.
It is in softer ground that I have problems, and wish for longer pegs. The wind loosens the pegs and pulls them free.
Oh yes, think I paid £8 for 10 of these pegs, complete in a decent individualised carry pouch.