@Sjef **************
We can only give advice, what ever you like to do with this advice is your choice. If you like to stay a longer time inside of Thailand, we see regular reports of people being denied entry using this Visa Exempt Entry or Tourist Visa on a back to back basis or with short intervals in other countries. That is the risk you take, you can prepare yourself for questions an entry points with the minimum for 20.000 Thb or equivalent currency in cash, proof of onward travel and proof of accommodation.