I havent seen any one talk about being turned away doing a land border run due previous visa/visit history.. Is this a possibility?

Not sure if my history would be questioned but this is it:

I am a USA citizen.. Over the past 12 months I have used one tourist visa (only stayed for 30 days of this) and 3 visa exempt entries and I have extended 3 times But only actually stayed for two of the extensions. Ive always spent a month or more out side of Thailand before returning.

Im currently in my home country and have a Tourist visa to be used next week.. Just wondering what my options are if I choose to spend more time after the visa expires.