Mike Myatt highlights the important difference:

Engage me, communicate with me, add value to my business, solve my problems, create opportunity for me, educate me, inform me, but don’t try and sell me – it won’t work. An attempt to sell me insults my intelligence and wastes my time. Think about it; do you like to be sold? News flash – nobody does. Now ask yourself this question, do you like to be helped? Most reasonable people do. The difference between the two positions while subtle, is very meaningful.