I agree (my own average commissions calculated over nearly a 3-year period, when I was trading spot forex, were 1.1 for EUR/USD and 1.4 for GBP/USD, using a no-commision "broker", i.e. counterparty market-maker).
For some, yes, doubtless ... but this depends on both your position-size and your trading frequency: I actually saved a lot of money in dealing costs by switching to a commission broker as soon as I could afford to.
(We're both not quite answering the OP's question, as he asked for it in terms of a percentage of price, but I don't understand why and never looked at it that way, myself.)