Simple rules to follow:
If you are not organized enough to remember to mail in the rebate forms, or to fill them correctly, or follow the fine print to the letter then do not buy with rebate. Only you are responsible for the mail in part.
And, you have to search and have some sense of what companies and/or processing centers have high rate of rejects, or need multiple phone calls, then do not buy on rebate from them.
The new Easy Rebate from Staples in USA seems to be working for me, really no hassle, my prefered place for buying with rebates.
Why do you care if only 30% of rebates are mailed in? If you are not responsible enough to follow the terms, then you cannot claim you are victim.
And, the major rule MUST be "fool me once, shame on you, fool me twice, shame on me". For example, I did not get 2 small rebates from CompUSA brands products, so I cannot blame anyone but me if I become greedy and buy CompUSA brand products with rebate.