@Marney *******
I think immigration officers are not stupid, and also see a lot of DTV holders just try to live in Thailand and used soft power activity or own company just as a trick to get a 5 year visa.
DTV is not meant as a visa to live in Thailand, and in combination with a number of visa exempt entries, that might trigger IO to check if intention of stay matches visa.
I very often see here questions like what is the cheapest way to get approved for DTV, that says a lot about the intentions of those people...