On line scams

I recently posted an online ad for the sale of GMan's Aprilia 125, and my RS250 basket case rebuild project. I want to sell the two and get GMan a bike more his size.
Had two hits todate. First one I responded to, but heard nothing else. No problem.
The second I responded to.
Herewith the correspondence that followed:-

First email is from the website:-

A visitor would like more information on your classifieds ad. Details below.
Email: ballack_stephen@yahoo.com
Message:
Goodday, How was the day?Am Ballack.Interested in purchasing your advertised ad.I will really appreciate your it if you can get back to me withthe present condition,pics and least price .Regards...Ballack

Ad: http://bikemart.thesaweb.co.za/Categories/All/32-Bikes-For-Sale/.html

Please report any errors or abuse to Bike Mart

My response:-
On Sat, 11/22/08, ma8xz wrote:

From: ma8xz
Subject:
To: ballack_stephen@yahoo.com
Date: Saturday, November 22, 2008, 11:02 AM

Hi there,
sorry haven't responded sooner - been busy...
Both Aprilia's for ZAR15,000.
125 Europa (naked Aprilia) in good running condition. Rebuilt 2 yrs ago, sprayed, etc. ZAR10,000
RS250 - completely stripped down, for rebuild. ZAR6,000

Or make an offer.........

I also attached a picture of the 125

Then his response.....:-
Hello
Thanks for the email response.

I have a Client who is so much interested in the item with the purpose of making immediate payment by a Certified Bank cheque That will be cleared into your bank account within 2 to 3 days.

He has responded very positively and i have given him my own price for selling to Him whereby added my own profit and commissions to your own asking price and he is ready to make payment.payment by a Certified Bank cheque.

Any amount that is more than your asking price that is going to be on the cheque will be sent back to me . The remaining balance you will be sending to me will be as my Profit,Commission and for the shipping.

I hope you are clear with my Email so you should Complete and send back the details below so that the Certified Bank cheque can be issued and mailed out to you:

NAME..................

ADDRESS...................

CITY........................

STATE.....................

POSTAL CODE.....................

COUNTRY......................

TEL NUMBER......................

Cheers - ballack stephen

I immediately smelled a rat. I am convinced this is one of those scams where a "deposit" is made into your account, and then you are expected to make a "refund" of the excess amount, and then a few days later the bank informs you that the deposit transaction was a) reversed, b) fraudulent, or c) never happened in the first place.

Alternatively, they use your details for their own foul purpose. Needless to say I'm terminating this correspondence, and have reported him to the website administrator as requested.
How many people around the globe fall for this crap on a daily basis? Must be big money to be made in this manner.
maybe an opportunity for 'self' employment. After all, if the Nigerians can do it, why not me?

Salagatle!