Do you update electrical in your rentals?

[Adam Moehn]

When I'm looking at houses to purchase as rental properties, a decent percentage still have fuse boxes. Many also have all or mostly two prong outlets. I feel like a lack of 3 prong outlets is impractical for modern life and fuse boxes are a pain to deal with. I know they would have been a deal breaker for me when I was a renter, particularly the 3 prong issue. 

For reference, I'm looking mostly at SFH in middle class neighborhoods, not low income but not high end. I've been estimating that I should budget around $3,000 to update these in a typical house, but haven't actually done any yet. So here's my questions for you:

1. Do you update to a circuit breaker and 3 prong outlets for your rentals?

2. What's a ballpark price to expect that this would cost?