Aircraft ownership always sounds great until the first maintenance item pops up. Whether it's an unexpected AD (nothing wrong with the aircraft, but a mandatory inspection, part change, limitation, etc, crops up), or you have an annual inspection. It's very common for someone to think they have a complete pre-buy inspection, think they're free and clear, and then find the first annual runs a thousand, five thousand or more.
It's not realistic to think of owning an airplane, putting in fuel, and flying cheap. Your maintenance costs should always be factored (at a minimum) as being the same as fuel. If you're burning six gallons of fuel at five dollars an hour, then you should be planning on setting aside 30 dollars an hour for maintenance, minimum. That's if nothing serious goes wrong. Need a jug replaced, there's 1200 for the jug and around 1500 to 1800 total for the jug and replacement. Radios no good? Big bucks.
So there's sixty dollars hourly. Not too far from the 87 you're being charged for rental. You're carrying insurance? Rates vary, but if you're spending a thousand or fifteen hundred for that insurance, and another five bucks an hour to your hourly cost (you're flying 300 hours, right?). Sixty five an hour, now.
Hangar at 200 a month, used for 3 months, six hundred bucks. That's two dollars an hour, so sixty seven now. You're still saving something, but nothing has gone wrong yet, you were miraculously able to find a hangar, you had ample experience and your insurance was cheap, and you're operating in a mythical world where everything happens in your favor.
Ownership can be a great thing if that's what you want to do. Being able to get into the airplane overnight isn't likely to happen, and don't plan on being able to sell it right away. You might, or it might go a year or two without a buyer. Factor that into your decision making, too.
Anytime "if" becomes a crucial part of the equation in aviation, see the red flags. In this case, when you're planning to fly with no maintenance issues, there is your red flag.