Not really, with 91 you're well within the safe zone.
Many not so great answers here also. I mean "there is always a possibility" yes and there is also a possibility that lightning strikes you but it's not something you'd need to factor in.
To get the money out of Thailand again you need to have it transferred in properly before buying the house. You must use an international bank transfer. So the most important implication of that is that you cannot work in Thailand and then buy a house; if you're a foreigner you can either work or buy a house but not both. Another implication is that you can't use services like Wise to get the money in. They use partner banks to send the money to your account, and it'll not be classed as an international transfer. You must use a bank to bank international transfer.
Technically you can also not buy if you don't satisfy the said condition, so you won't have an issue being able to send the money out again.
there's an important difference between with and without a visa though: having a visa you're not supposed to be refused entry. It comes down to having been given entry permission by the respective country's MFA, which ought to have weighed in all the relevant factors available, e.g. also your entry history. Although an IO can technically refuse entry even to entrants with a visa, we must assume that they won't. Not having a visa means that whether or not you are good to enter is entirely determined by the IO, and that's where your history is then considered.