for immigration its tuesend times better if you have a really visa. Yes with visa you can have ticket back about 90 days. I think you are a Newbie in Thailand. I have already stay 28 years.
A Visa its a Visa. Thats show immigration thats you have correkt paper. And you can bee sure they not denied entrance to the Kingdom. With a Visa you can have your ticket back from Thailand in 90 days. Whit out only 60 days. With a Visa you dont need take cash with to the border. Whit out you need
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baht to show if they ask. If you have multiple entrance you dont need to worry if you do a border run. You can stay up to 8 months legally in Thailand if you handle a multiple entrance Visa correkt...
You can not have bank account and you cant have 5 years drive License on DTV. You need to leave every 6 months and you must do 90 report self or pay someone...