When you max out your 60, get another 60 and max it out, then try for another it kinda looks like you're trying g to live here on visa exemptions. It's just a matter of time till you are called on it. They want you to get a proper visa if you want to stay long term.
this was last year when you could only get 30 days visa exempt. The actual visa you apply for before you go. The exemption you just show up and they stamp you in. Now that the exemption is 60 days, nit much difference. I'm sure someone will know