SegWit addresses don't safe on fees when receiving transactions, the savings happen when you make a payment from a SegWit address.
When sending to a P2PKH the pk_script is:
OP_DUP OP_HASH160 Size PubKey_hash OP_EQUALVERIFY OP_CHECKSIG
bytes: 1 + 1 + 1 + 20 + 1 + 1 = 25
When sending to a Bech32 address the pk_script is:
OP_0 Size PubKey_hash
bytes: 1 +1 + 20 = 22
paying ~58 people with Bech32 means 174 bytes smaller
