Is it wise to book a round trip flight for a one-way Non-O visa entry into Thailand?

Booking a round trip flight as a way to save costs, when entering Thailand on a Non-O visa and without intentions of leaving, is generally acceptable. The main points raised are that if you don't take the outbound flight, you'll simply be marked as a 'No Show', and your return flight will be cancelled without incurring extra fees. Additionally, some suggest booking the return flight several months in advance, particularly for business class tickets, which often allow for date changes without penalty.