Mista,
If you look at it like this...it is one more credential that separates you from the rest. Another thing, it will help you to be more intimate with Multi-Engine concepts - if you follow me.
I have had my MEI since March of this year, and I didn't start using it until about 2 months ago. So what if your flight school might not have a twin, but if you putts around your airport and bump into people that own a twin...it can be a beautiful thing
Also, you may not have to purchase Multi time...IT WILL SAVE YOU A BUTTLOAD OF MONEY!
I guess if you want to look into the future, when you are a Captain...and you have an FNG sitting right next to you, you will be able to sympathize with him/her a little bit better - hehehe.
I know these are a lot of scattered thoughts, but I am just saying whatever comes to my mind...I hope this helps you out Bud...
Good luck, and let us know what you decide...
Lax