Right, which is what I was talking about in the original post.
You don't need ultra-low latency to put in that $9.98 order to keep the market moving. If you were serious about providing liquidity you'd have tons of bids and offers open all the time. You would be holding tons of stock at the end of the day by the nature of the business.
HFT firms tell you that they are making life easier for traditional investors by providing liquidity, but that doesn't make much sense given how they operate.
It’s not a service that’s on offer it’s a fundamental market behavior that any participant can engage in.