There is far more to making an investment than choosing a product and investing. Even if you get a good return on your investment, much of it can easily be lost to the taxman. It is possible to lose over 50% of your profit because of the taxes you have to pay. For this reason, tax efficient investing is important.
In the current economic climate, looking at the tax implications is even more important. This is because revenue returns on investments are relatively low, so it is even more important that you keep the bulk of your profit rather than giving it to the tax authorities.