no - quality, service, price & convenience are determining factors, regardless
of how product or service is marketed.
Obviously you make yourself aware of every product or service in every sector and in every territory that you are likely to consume.
If you think you have enough time and are independently minded enough to avoid marketing having any relevance in your purchasing desicions then you are either very mistaken or you are some kind of robot.
Marketing will virtually ALWAYS have an effect, as all of the factors you have mentioned are not absolutes put are perceptions and your perceptions will always be influenced by your environment and how it relates to the products and services you consume. Marketing tries to control that enviroment and therefore your purchasing, and very often without your knowledge that it is even shaping your opinion.
If a product is available to you at the same price and same quality as another but one is available through a retailer on your and every other street corner, but the competitior is available only at a retailer 20 miles away it is no guess which you will consume. Then you should ask yourself why the two products are not both available through the retailer on your street corner... The answer is likely to be MARKETING!
Marketing is not Advertising and you should not mistake it for such.
On Mark's question, he knows as well as I do that although we like the answers that come from the hardcore drag racing fans, the sort you'll find here on the 'mater, they are skewed, as here we all are very sponsor aware and know our loyalty has a effect on the sport we enjoy. The truth of the matter is that amongst the average fans/spectators at the track and watching on the TV the answers are likely to be not quite as positive especially in the current climate.