I would be delighted to get filled on every order I send. HFTs usually flicker quotes due to fast changes in their valuation model or software bugs combined wit

I would be delighted to get filled on every order I send. HFTs usually flicker quotes due to fast changes in their valuation model or software bugs combined with insufficient risk controls. Smart HFTs actually try their best to avoid sending orders. It's incredibly expensive latency-wise compared to leaving your quotes alone and you give up queue position.