Sound Reinforcement and Assistive Listening

Should sound reinforcement (amplified sound) be installed with assistive listening systems?

I can think of some good reasons as to why it should be:

1. The person speaking gets feedback as to how well he is using the microphone (too far away. too close, too quiet etc (AGC can only compensate so far
2. If the speaker inadvertently taps/knocks or rustles paper near the microphone, he will hear it and stop doing it


3. [If the system is not working, it will be obvious to everyone and will get switched on/ repaired/li]
   

Reasons for not doing it:-

1. Cost - although it need not be expensive.
2. Risk of accoustic feedback - quite low if the amplification is just for monitoring purposes
   

I have given many presentations where induction loops have been in use with and without sound reinforcement. In those situations where there has been no sound reinforcement I have to appologies to all those hearing aid users that were subjected to my blunders. I should know better, but I have moved away from the microphone and carried on speaking, rustled papers by the microphone or nervously tapped the desk where it is positioned on more occassions than I care to remeber Is it really just me or is this a common problem?

Has anyone had similar experiences?
Will adding sound reinforcement help?