Sometimes giving free information is the best and easiest way to show how professional you are and that you are worth paying for. Sure, B&Q has the plastic tools and the tubbed adhesives etc and they make it look easy so a lot of DIYers will buy it and get on with the job. There are also those who might want to check first on a forum like this and then they find out about different types of adhesive, tanking, substrates and cutters. At this point a lot of them will prefer the idea of paying a professional and at least they will know exactly what they are paying for and why. One of the most successful marketing methods these days is 'give to receive.'