If you can afford the parts to maintain it properly, go for it. If the prices will be a problem, owning one will not be much fun. For example, $300 for a water pump plus labor, $80 in parts for an oil change plus labor, etc. You can save a lot of you plan to DIY for most repairs, but I would budget at least $1000/year for maintenance, especially if you are buying one for less than $10k. The costs could vary a lot year to year, or happen all at once, it depends on the car and how much you are driving it. Definitely get a pre-purchase inspection from a good Porsche mechanic, it's worth the money to avoid buying a car that will need a lot of work upfront. As mentioned above, insurance prices could also be a factor.
The most expensive car you can buy is a cheap german car. Good luck with the decision.
