Are you comfortable with using these techniques? If you cant sleep at night because you feel you have conned or mislead someone then this isnt the strategy for you.
Is your business dependant upon repeat purchases from customers? If the answer is 'yes' then these tactics are possibly too short-term for you.
Is this business strategy widely used in this industry to the extent where it has become the 'norm'? Xmas sales often only feature products bought in specifically for the sales and often prices are inflated at 1 or 2 stores (if you have multiple outlets) prior to te 'sales', but Joe Public expects to see discounts
If the law changed tomorrow would you still have a business?