BMW Repair: Spark Plugs, supercharger kit, compression stroke

Question
Ok,

this means, besides getting my engine re-built, the only solution is to change the OEM plugs (very) often?  

why do so many talk about putting a hotter plug in ?   is there ever a time that using a hotter plug is appropriate?

I don't even know what a "hotter" plug means - can you tell  me?

Thanks

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Followup To
Question -
My 318IC burns ALOT of oil and I think I need to run a hotter plug.  What plug would you suggest?

thanks!
Answer -
A hotter plug changes the resistance and affects the amount of spark is available for the ignition.  Use OEM plugs with factory gap.
-cheers

Answer
The fact that your car burns so much oil tells me that it's on it's last leg, why not figure out whats wrong with it now before the engine dies and leaves you stranded with a much bigger bill than you would have had if you fixed it now?
The heat range on the plug is set up for the engine because BMW figured out how hot the plug should be in order to prevent preignition (very harmful to the engine).
Heres a couple explanations I have found on the Internet.

"When driving with a heavy throttle, the tips of the spark plugs are heated to incandescence. The heat must travel from the tip through the shell and ultimately into the water jacket of the cooling system before the next compression stroke. If the tip is still glowing when the piston comes up with fuel, the fuel will ignite before the timed spark -- and you've just blown a hole through the piston."

also:
http://www.nagca.com/grandtech/sparkplugheat.htm


People talk about hotter plugs when running different compression ratios, adding boost and for stroker kits, I personally deal only with what the manufacture (whom has spent billions researching what is best for my car) rather than some generic company with a turbo or supercharger kit.
-cheers