I am sure that the sponsors appreciate your sense of loyalty. Detail City is a great place for car care product vendors and manufacturers to advertise and we hope that they are reaping the rewards that come with supporting this website.
With that said, as long as we aren't dealing with a filthy, stinking spammer or a shady product shill, members are and have always been encouraged to be helpful. It's all about intent.
If the member has good and helpful intentions then they are welcome to make recomendations. If a member has a bone to pick with a sponsor, that's bad. If a member also profits from making certain product or vendor recomendations, that's bad. If a member is an undercover shill, I will show them the door.
It would be great to see Detail City members 100% loyal to Detail City sponsors, but that is not realistic. It certainly isn't official policy or enforced. For those that are loyal and have chance to make a purchase elsewhere cheaper, you can always call, email or PM your favorite sponsor and give them an opportunity to price match. Just make sure that you are looking at the bottom line price and factor in all the discounts and shipping charges when doing comparison shopping. $10 with a 10% discount is better that $9.50 and no discount.
Bottom line from The Fuzz. Buy what you want from who you want. Be helpful and unbiased and everything will be just fine.