This being Thailand anything's possible, although I can't say that I've ever heard of this happening.
The property owners main concern is keeping the units fee-earning - where 100% capacity is always what they shoot for. If they were to raise the maintenance fees an unreasonable amount they would almost certainly put-off prospective buyers and possibly lose current residents as well which is a bad thing.
It's the same scenario with many renters over here - where the landlords commonly go for years without raising the rent for the same reason. It's all about "Utilization". I've rented numerous units over the past two decades and can't recall ever having my rent increased. Of course there are no guarantees that this won't happen, but I rank it very low in risk.
When you think about it short time sex in Thailand cost around 1,500 baht back in the 1990's - and it's still the same to date.
Go figure...