Not at all.
A defined need, quality and value make me want to buy something. I wish these big companies would stop wasting money on marketing and just focus on making great products at a good price. I suppose all those marketing dudes would be out of a job and might have to actually put in a hard days work and make something instead of talking shit all day.
For some insight on this world I would recommend the book “City Slackers” by Steve McKevitt.
I suppose you could make the argument that these companies are helping to grow the sport and therefore should be supported. However, I seriously doubt Halfords and their ilk are in it for the love. I do support my local bike shop as they put back into the community organising events and helping to promote cyclists rights in the area.
I suppose it depends in the scale and perceived benefit. Big company supporting TDF or World Cup, no influence on me. Small company making a difference in my world, big influence on me.