Interesting... That's what my doctor told me so it's second-hand information from a usually credible source but I think you have a real point there. I don't know the facts but here's some relevant information
It seems that Thailand allows "nationals from Bahrain, Kuwait, Oman, Qatar, Saudi Arabia, and the UAE, to stay in Thailand for medical treatment up to 90 days without a visa. A medical tourist may be accompanied by up to three individuals who are also Gulf state nationals such as parents, children, spouse or maid - who also have a 90 days visa exemption."
As well...
"Saudi citizens are obliged to get clearance from Saudi Arabian authorities if they want to travel to Thailand and give detailed reasons for such a trip. However, as per a report by Saudi newspaper Al Riyadh, many Saudis are circumventing the ban by travelling via third countries to Thailand.
There are even local Saudi travel agencies that arrange a suitable itinerary, mostly via Dubai, and offer hotel bookings and organised trips without official clearance from official governmental departments.
No Saudi has ever been refused entry to Thailand, but they face problems when going back to Saudi Arabia with the Thai immigration stamp in their passport. Apart from a financial penalty, they also risk a two-year general travel ban."