No, I won’t. Or only after crossing out the “please”.
Because I get annoyed by people abusing language.
“RSVP” is the abbreviation for the French sentence “Répondez s’il vous plaît” which translates as “Please reply”. Therefore, RSVP does not need an additional “please”.
The Happy Hermit 
Amen, brother! I’m quite the petrolhead (gearhead for us Yanks), and consume a great deal of information about cars. The latest trend is for advertisers (especially Ford) to proclaim that they don’t just speak “RPMs”, but also “MPGs”. The problem? RPM and MPG are both inherently plural – revolutionS per minute and mileS per gallon. If you don’t know how to use abbreviations common throughout your industry, why should I trust your product? (Which I don’t – I’m a lifelong GM guy. Sorry, Ford lovers! :) )