'96 Honda Civic EX Repair Questions

Hi-
On 10/20 I took my '96 Honda Civic EX with 141K miles to my mechanic because the engine sounded like it was "struggling". I was told that the noise was coming from the trans main bearing and that it needed to be replaced. Also, it was suggested that while the trans was out of the car, I should have the clutch replaced since the clutch had never been replaced. There was nothing wrong with the clutch but since I had 141K miles on the car and since the clutch had never been replaced, it was strongly suggested that I should have this done.
So, on 10/20/10, I had the trans main bearing replaced, the clutch replaced and the flyweel resurfaced. The total cost for this work was $1381 + tax.
A little over 6 weeks later, on 12/4, while driving on the expressway, trying to get off at my exit, I couldn't downshift. I couldn't get into gear, I couldn't get out of neutral. I had the car towed to my mechanic. I was told that the clutch master and slave cylinders had gone bad and leaked out fluid. Both the master and slave cylinders were replaced on 12/4. The total cost was $618 + tax.
Here are my questions:
1. Were the prices charged for the work I had done fair and reasonable? And
2. When they replaced the clutch on 10/20, shouldn't they have checked the clutch master and slave cylinders at that time? It seems strange to me that thay would replace the clutch yet not check the other parts that are needed to make the whole thing work. Besides the headache and danger of not being able to get in gear on a busy expressway (not to mention the cost of towing and cab rides), it seems odd to me that just 6 weeks after having the clutch replaced (as a preventative measure no less) that the clutch master and slave cylinders would go bad.
Any insight you could provide would be greatly appreciated. THANK YOU!