Businesses use bulk for two reasons...for convenience and to maximize profits.
I seriously doubt that business men ever consider ecology over profit when they make decisions about how they do business.
None of the fluids/lubricants I use come in bulk. However, if a business could show me that they have Redline or Mobil 1 in bulk, then that would be a different story. At least at a Mercedes dealership I can get 0W-40 Mobil 1 and Mercedes fluids and lubricants.
However, as long as I am able to do my own maintenance I can be as anal retentive as I wish to be