There are only 4 rare plans that can drop in Act 1, they're 4-affix and worthless. I have found exactly 1 legendary plan in Act 1, and it wasn't worth very much, maybe 400k.
Since the patch, I've found about a dozen legendaries between 3 bots, and half of them were worth only about 10k or so, 2 of them were only worth salvaging for a brimstone, and one of them was about a million.
I don't think anything has changed that we don't know about. You can still find up to level 63 in Act 1, and it is just as much of a chance at being legendary as anywhere else. Think about the probability, though. Act 1 has only a 2% level 63 drop rate (if I remember correctly). The chance of that drop being legendary is crazy low. So, you're taking that crazy low chance and multiplying it by that other crazy low chance, which is even lower chance of finding something really really good.
That said, I have been very pleased with the drop rate for my bots in Act 2. I think its more profitable than Act 1, once you have the gear you need for it. My gear sets for Act 2 cost between 10 and 15 million.
Since the patch, I've found about a dozen legendaries between 3 bots, and half of them were worth only about 10k or so, 2 of them were only worth salvaging for a brimstone, and one of them was about a million.
I don't think anything has changed that we don't know about. You can still find up to level 63 in Act 1, and it is just as much of a chance at being legendary as anywhere else. Think about the probability, though. Act 1 has only a 2% level 63 drop rate (if I remember correctly). The chance of that drop being legendary is crazy low. So, you're taking that crazy low chance and multiplying it by that other crazy low chance, which is even lower chance of finding something really really good.
That said, I have been very pleased with the drop rate for my bots in Act 2. I think its more profitable than Act 1, once you have the gear you need for it. My gear sets for Act 2 cost between 10 and 15 million.