ONCE YOU GET THE RIGHT BLEND....CHANGE IT !
As the market changes so must you, what worked very well yesterday in the marketing world probably will not work so well tomorrow. This is down to two main reasons.
Reason ONE: Like it or not everyone copies everyone, and to have a successful marketing campaign you really need to be the pioneer, and the forerunner. If only one company is doing a certain thing, suddenly that company, if only for a short period has something unique and different to offer its customers.
Reason TWO: Is totally an effect of reason ONE, if everyone is doing the same thing, you no longer have the edge. To this end you NEED to keep re-evaluating and changing the way you market yourself!!!