Update from coupon begging

So its been a couple weeks since I sent letters to a bunch of companies about coupons and samples, and I got a ton of mail yesterday after the holiday and my vacation. Here is the original post and below is an updated list

• Hawaiian Bread - Emailed me a nice personalized letter, told me to look for the two free products coupons in the mail.  - I RECEIVED MY FREE PRODUCTS COUPONS AND ALSO TWO 75 CENT OFF PRODUCT COUPONS
• Crayola - Emailed saying they put a coupon to enjoy their products in the mail- RECEIVED A FREE "MY FIRST CRAYONS" SET FOR LITTLE GUY AND TWO COLORING BOOKS
• Welches - Emailed, told me to sign up for their newsletters to get coupons  - THEY SENT ME COUPONS ANYWAY - 75CENTS OFF - THREE OF THEM!
• Bustello - GOT THREE COUPONS FOR 1.00 OFF EACH
• Michelen's - received three 1.00 off any 2 coupons  
• Friday's - I sent them a compliment letter a couple weeks ago, not even related to this experiment, on their new management at a local store where I had always noticed bad service, and they actually sent me a coupon for 10.00 of any entree'

Have any of you done this? what were your results?