Thanks for answering.
I will experiment with a few other wallets, I think required confirmations should be adjusted to spending amount.
3 confirmations waiting time can be very long when you are hungry ;-)
The required confirmations depend on the type of thing you buy/sell. For small payments 3 confirmations is fine. You wouldn't sell your car with one confirmation.
IMHO no. Number of confirmations required depends on the person who you deal with. Some people is fine proceeding with 1 confirmation, some wants 2, some wants 6 etc... Some exchanges require Bitcoin deposit to have 6 confirmation, some only require 3 confirmations regardless of the amount.