Pennies Worth 5 Cents Each?

Do away with the penny, but continue minting them for collectors only.

Have not thought it thru, but there seems to be way to many issues to stop the penny. The first is sales tax. Any odd cent tax would immediately be adjusted up to the next divisible amount by 5. So, 3% becomes 5%. Hmmmmm, the states would love this, an automatic tax increase caused by the Feds, wow even someone to blame. No odd cent amounts like a 37 Cent stamp, can't make change. Cost of living index would move up immediately as all odd cent prices of products would be adjusted up and , OH MY, inflation just moved up 2 or 3% and Bernanke is raising the Fed Fund rate to keep inflation under control. And, gas prices will no longer be measured in 10ths like $2.07 9/10 so energy prices just went up. Naaaaaaaa the penny, oppps cent, is just to important. Now, the nickel can be replaced by 5 cents so we really don't need it yada yada yada.
Jim