There are many other reliable small sedans that may be purchased used for much less than Prius. I would first consider those by Honda and Toyota, but there surely are others. By checking their maintenance history as well, you stand a good chance of avoiding abused ones, so that the total costs of ownership will likely be less than with the used Prius.

This can be a very sensible way to go. The only thing is that you cannot get the very low pollutant emissions of the hybrids in this way. If that is a major factor in the vehicle choice, then the potential repair risks need to be considered as well.

So far, there are very few Prius with such big numbers on their odometers, so it is really not possible to quantify that repair risk yet. It is pretty much an extrapolation (for me) to say that they will continue to be extremely reliable, and quite appropriate to question such extrapolations.

DAS