Depends on how homogenous your sample frame is and how much risk you can accept. It would be tempting to jump all over your response, but I believe you are sincere in your position. Sadly you are not alone. This type of error has become epidemic of late, particularly in the on-line research field. It is, in my opinion, a contributory factor to many business failures at a cost of tens of billions annually to investors.
People can lose their homes and savings when they lose their jobs due to a research error.
But, I won't lay the full responsiblity for this on your shoulders. Rather, if I can enlighten you, maybe there is hope for us all. The flaw in your reasoning is that markets, including Business to Business markets, can never be homogeneious because they are comprised of people. Even if the businesses were perfectly homogeneous, the people are not. Proof of this is that, if they were, then either all would have responded to the survey, or all would not.