Just bought my 30 year old home last year. Have made quite a few upgrades so far because it was necessary but as far as "general" maintenance goes it's been pretty negligible. Of course replacing a roof is a shit ton of money but when you only need a new one every 30 years that $20,000 bill can be spread across 360 months for a total of $55 a month. You just need to be knowledgable enough to know what the maintenance costs and account for it ahead of time not last minute after you have already been greedy and spent all the money you collected the past 30 years.